An independent self-exclusion service, Gamstop is unaffiliated with any gaming sites or even the British Gambling Commission. You can self-exclude for six months, one year, or five years when you register. If you join Gamstop, you will be unable to access any of your existing accounts with any of the casinos listed on the site. For the period of your block, you will be unable to sign up for an account at any of the participating online casinos.