WebAssembly is coming for games next. Near native performance, players can join with just a link, and no 30% cut that developers have to deal with.
You only deal with the Steam or EGS or Gog cut if you're utilizing their storefront; if you are just hosting the game on your own site, then whether that game is a webassembly package or a desktop application, you don't have to pay some gatekeeper (other than your file host). Same thing with Android, though there is a bit more friction there.
The reality of you selling your game at a profit without the help of one of these app storefronts is improbable. Keep in mind that even if you somehow become successful in this regard, these storefronts have a vested interested in making sure you and your technologies fail.
Edit: apologies if I seem dire, I'm actually on your side and WISH that the world was a free market without all these gatekeepers. Myself, my partner, and many of my close friends constantly battle with these "gate keepers" as game devs/designers and I wish they would go away, but the market (users) love (to use) them even when they hate them.