use slow mode and add some admins to ban such users. But the other question is: Can any admin with ban access, ban every other members of a group to destroy the group?
You're being dramatic it's just a group chat.
"Can admins ban people?" - yes
I think you meant to ask "Can an admin sabotage a group by banning everyone?"
Yes. Don't have admins you don't trust
only members or admins promoted by them
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