I personally get most of my games from GOG and itch.io these days. And I've never bought anything from the Epic store whatsoever.
I will say though that I find it kind of weird how much hate Epic gets for their store. Like, I understand that someone prefers Steam, or doesn't want to buy stuff from Epic etc. - but what we see goes way beyond that. Epic has people actively campaigning against it, as if its mere existence is insulting. I don't really get why.
As for the 30% cut... Developers will try to price their games competitively, and within customer expectations. So with or without Steam's 30% cut, you can expect games to be similarly priced. The large 30% cut from Steam is basically coming out of the developer's revenue rather than from your pocket. (I'm under the impression that GOG also has a similar 30% fee. Epic has a lower fee. And on itch.io the seller gets to choose how money goes to itch.io anywhere from 0% to 100%. So itch.io is the best deal for developers in terms of fees.)