Kongregate is a community-driven browser games portal with an open platform for all web games.
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Kongregate has two major errors to prevent spam accounts. Firstly the email is not linked to the account, allowing like riddle says any number of Kongregate accounts to made. The second is the inability to withdraw the account. I expect many users have changed their minds about how they want to be seen on Kongregate and made new accounts, but are unable to remove their disused old ones.