I don't see the problem with that personally, since there's basically no restriction on how you distribute your games on the platform. It's not like iOS where you have 1 option.
People publishing games just have to do the math and see if the benefits justify the costs.
my point is that valve/steam takes 30% "because they can". they could charge 5% and im sure still make tons of money. it's still a cut throat business, and while yeah they could be doing shittier things to make more money, i think they also do risk assessments on disturbing the golden goose
People publishing games just have to do the math and see if the benefits justify the costs.