Any of those places charging 30% on a product they're only publishing electronically is using walled gardens and monopolistic practices to do so.

I'd rather they go after Steam last, but Steam belongs in that group with Apple, Google, and Microsoft. It's extraordinarily difficult to sell your PC game without Steam. A few large studios can do it, but not many others.

Still notas egregious as Apple, and now Android with their restrictions on side loading.