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I think it would be best if team mates agree on what they expect from being together in a team in the first place. It‘s possible to make teams that are invitation only instead of open ones.
In both cases, team leaders have the ability to remove players from their team if they wish to do that.
Also you and everybody else that is not happy with their team, can leave and form a team on their own. Or join another, more active team. For example if your team leader happens to have stopped playing/answering at all.
So there are several ways to end up in a team and with team mates you like.
For getting all requests fulfilled, you need 6 active members.
Personally I would not want some automatic deletion. We have everything in our team, from little activity to very active players. But then we are a bunch of friends that decided to team up, and no place for strangers to come and go on a daily basis. It‘s way easier if you like each other much 😉😄.