I wasn't advising the imminent demise of the Itch.io platform: I too think/presume itch.io is doing fine as surviving entity.
The problem is the margin of itch.io growth; which is being eaten by more dirty tactics of Epic (bribe popular indie developer and throwing money at loss until they don't find a nice spot vs. Steam: then fuck them all with Microsoft's deal they got)
I would too complain Valve's Steam; but that's more an issue on the indie side. Valve was there straight from the beginning of digital store distribution.
What I do complain is about indie developers who, once reaching a relative success, forget the home community they come from: just because they dream to be big player with Valve or Epic.
As indie developer you can still growth with Valve, Epic, Google or whatever: just don't forget to support itch.io (if you still have resources to do so at least)/where you come from.