I mean abuse in the way where they are taking advantage of their position in the market.
There are several online game retailers publishers can utilize and being profitable is always going to be part of their business model. Epic would do it in their own way no matter what Steam did.
Even Humble Bundle isn't perfect. You can read this article for more information but they trialed removing the slider that decides where your money goes in 2021 and even now the Default Donation and Extra to Charity options still only give the charity a small percentage.
It's just an unfortunate reality.