Two important things though:
"In TMM you can, well, team up to achieve a higher rating. Team up with some lower-rated friends and the effect is increased."
You decide if you join a balanced game or not. If you don't wanna play, you just leave the lobby or kick the players which are insanely overranked (Which is the reason why most of them are either on my foe-list or get kicked). Aka you chose whether you wanna get rank or not, on TMM? No choice left.
The players which have a way too high global rank don't even participate in a tourney, feel free to name me a couple of them. That basically makes it irrelevant since 99,X% of the tourney players are "casual" players and none of the type "let's stack a game for more points. Stonks."
=> Being overranked (global) is a decision you have a huge impact on. On TMM you can only throw a game on purpose but nothing more