These scammers now have the habit of adding people to their groups, hoping that some unsuspecting victims will fall into their trap.
After being added to the group, you will see a lot of staged transactions as the scammers will pose as buyers, sellers, and escrows.
They carry out more successful fake transactions to gain your confidence and the moment you try to either buy or sell, you send cash or crypto, they will kick you out of the group.
Another thing is to use complex characters in the group name to make it unsearchable. So that once they kick you out, finding the group will be impossible.
Avoid and block those scammers once they add you to random groups.