I'll use that for things I already have in my library, either from my Windows days or from giveaways, but I'm not going to spend money in their stores when they don't officially support me as a customer. Unofficial launchers like this could be broken by those storefronts at any time, and they were never guaranteed to work for me. GOG fares better than Epic in this regard, since they do sell Linux games, but I want official cloud saves and automatic updates as well.