The banning of people from the group has greatly encouraged us in the community here in Brazil because we are united and know exactly who the bad users are, the toxic ones who use some kind of hack. Banning them from the group and creating secure instances has greatly motivated us. However, it is not possible to ban the bad user before they join the group, which forces us to always create instances that either block more people than necessary or leave it open for them to enter.
Therefore, I earnestly request that you kindly add just a small feature to your front-end to be able to ban them from the group even before they join.