Question: Who owned the online poker cardroom which has Victor Ramdin as a member?

Context paragraphs:
Mark Vos: Mark Vos (born 20 October 1983), also known as 'pokerbok', is a professional poker player from Australia.  Vos was born in Cape Town, South Africa, and attended Waldorf High School in Constantia.  He excelled at mathematics olympiads while in high school, and represented his province in the interprovincial olympiad.  Vos permanently deferred his actuarial studies at Macquarie University, to play poker full-time.  Starting out online with limit hold'em in mid-2004, Vos soon turned his attention to no-limit games, and in short time, earned a reputation as being one of the world's top online poker players, such that he can often be found playing in the most expensive cash games and tournaments online.  When not travelling the world playing poker, Vos plans to divide his time between Australia and South Africa.  In January 2006, Vos finished 8th in the main event of the Crown Australian Poker Championship, winning A$83,600.  As of May 2006, Vos represents the Full Tilt Poker online poker cardroom as a friend of Full Tilt Poker.  His name is reflected in red on Full Tilt tables.

World Sports Exchange: World Sports Exchange (also known as WSEX) was an online bookmaker offering sportsbook gambling odds and sportsbook wagering lines including, football lines, basketball odds, baseball parlays, hockey odds, and horse racing track odds.  Established in 1995, it was one of the pioneers of internet gaming.  The company also used to run the "World Poker Exchange", an online poker cardroom.  That operation ended on February 15, 2012.

PokerStars: PokerStars is an online poker cardroom owned by The Stars Group.  It can be accessed through downloadable poker clients for the Windows, macOS, Android and iOS.

Cereus Poker Network: Cereus Poker Network was an online poker network comprising Absolute Poker and Ultimate Bet.  The site is now insolvent and not processing player withdrawals.  Cereus is owned by a private company, Blanca Games.  Blanca Games bought all Network assets in August 2010 from Tokwiro Enterprises.  The Cereus network was one of the world's ten largest online poker cardrooms prior to losing the majority of its player base in the wake of the April 15, 2011 online poker indictments.

Viktor Blom: Viktor Blom (born 26 September 1990) is a Swedish high-stakes online poker player, best known by the online poker name Isildur1.  His rise to fame drew considerable attention around the poker world in late 2009, when he took part in all ten of the largest pots in online poker history.  In December 2010, it was announced that then-anonymous Isildur1 had joined Team PokerStars Pro.  Blom's identity was revealed by PokerStars on January 8, 2011, at the PokerStars Caribbean Adventure.  Blom parted ways with PokerStars in August 2012 and was quickly signed-up by Full Tilt Poker on October 15, 2012, along with rival high-stakes player Tom Dwan.

Planet Poker: Planet Poker was the first real-money cardroom for playing online poker, opening in 1998.

Online poker: Online poker is the game of poker played over the Internet.  It has been partly responsible for a huge increase in the number of poker players worldwide.  Christiansen Capital Advisors stated online poker revenues grew from $82.7 million in 2001 to $2.4 billion in 2005, while a survey carried out by DrKW and Global Betting and Gaming Consultants asserted online poker revenues in 2004 were at $1.4 billion.  In a testimony before the United States Senate regarding Internet Gaming, Grant Eve, a Certified Public Accountant representing the US Accounting Firm Joseph Eve, Certified Public Accountants, estimated that one in every four dollars gambled is gambled online.

888poker: 888poker. com is the second largest online poker network in the world and the second most popular online poker brand as of December 20, 2013.  888poker. com is operated by 888 Holdings plc subsidiary Cassava Enterprises Ltd under the laws of Gibraltar.  888poker was launched in 2002, offering players traditional poker games such as Texas Hold'em, Omaha poker, and Seven-Card stud.  Avi Shaked owns roughly 50% of 888 Holdings through family trusts, while Shay and Ron Ben-Yitzhak own 11%, also through a family trust.

Victor Ramdin: Annand Mahendra "Victor" Ramdin (born May 28, 1968 in Georgetown, Guyana) is a professional poker player, based in The Bronx, New York, who has won a World Poker Tour (WPT) Championship and is a member of Team PokerStars.

PlayWCOOP: The PlayWCOOP (PlayWorld Championship of Online Poker) is a series of poker tournaments taking place every year in online poker room PokerStars.net.  It is dedicated to amateur players and is considered the largest Play Money series of tournaments in the world.  Its creation was based on WCOOP (World Championship of Online Poker), which also occurs in the PokerStars room.  The first edition of PlayWCOOP took place in 2014 and featured 66 events.

Supporting paragraphs: Victor Ramdin PokerStars
Answer: The Stars Group