If someone behaves badly (for example, steals your content), you can ban that person in your membership bot.
Banned user won't be able to use your bot at all (including making payments and getting invite links) and also he will be kicked from all channels and groups added to the project.
To ban a user, open your membership bot and send /ban XXX, where XXX is Telegram user id number. If you don't know the user's id number, you can find it in your Dashboard (Project > Dashboard > Users).
To unban, simply use /unban XXX.
NOTE: When you ban a user, it does not cancel any recurring subscriptions they may have. You need to cancel their subscription(s) separately to prevent them from continuing to be charged for the subscription, even though they're banned.