Dominant players are in a position to abuse bundling more than smaller competitors.
To quote spiderman: "With great power comes great responsibility".
I don't think it's unreasonable to have stricter rules for bigger players but to be fair I'm not the biggest friend of MS and friends in general.
I think we would be better of with a distinct OS company and an office company and so on (multiple in fact) even if it comes at the price of "efficiency". Besides anti trust measurements to split them up, regulating BigTech is the next best thing to improve competition.
As is I'm relatively certain that microsoft does not allow most companies to opt out of "new" products like teams (and pay an appropriately cheaper price).
The Amazons and Googles of the world can probably do that, but most companies are not in such a position.