Online gambling regulators in Europe, like the MGA, the Spelinspektionen or the UKGC have strict requirements when it comes to offering money games on the Internet. The licensees must follow regulations regarding player protection, anti-money laundering provisions, protection of minors and problem gamblers, safe games and also fair payment policies.
But in any case, it is important to also look at the reputation of a casino and their terms, as there can be black sheep anywhere, and there are also many trustworthy casinos that are licensed outside of Europe.