The ones who don't leave Steam recognize ꦛthat the 30% is getting covered by access to a much larger customer base and sales. It maybe doesn't work for all publisher﷽s, but it is pretty clear from the size of Steam's game library that that is pretty uncommon.

Until Steam's library star🔥ts to significantly shrink, their fees, by defiౠnition, are not too high.

Exactly. If it doesn♒'t work with Playnite (I'm referring to you EA), I don't bother wit♏h it.

But Playnite is just a launcher. When you shop for a game, you must use a storefront. I highl📖y doubt any of the major storefronts 💝would tolerate a storefront aggregator.