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 group added to the project.
To ban a user, open your membership bot and send /ban XXX, where XXX is Telegram userId. If you don't know user's id, you can find it in users list (Project > Telegram Bot > List users).
To unban, simply use /unban XXX.