One for all and all for one - 2

To prevent teams from rushing to merge, smart people came up with a rule in team games: the first team to win on the first board gets the point.
Regarding the claim that chaos begins after 5 people, I'm baffled, fellow strategists. In the Russian army, the smallest tactical unit is a squad, consisting of 8 people. The squad leader is a sergeant. And you're already struggling after 5 players.

Added 2 minutes later

5 max - that's already too many, there are very few teams left.

With 50-70 participants, that's 7-10 teams, which is quite a few.

Added 4 minutes later

3) crediting the result of each match, not based on a majority, i.e., the score is not 1:0, but 4:3, 5:2, 6:1, and even 7:0

I want to clarify this point: if a team wins, say, 5:2, then they are awarded not one point, but 5. And their opponents receive 2 accordingly. Therefore, it is important to try to win with a crushing score, and on the other hand, even if your team has already lost 4 matches, you still need to fight and win. In short, every match is important. And now, two people win, and the third might not even play.