Meh, I don't have anything against them. Locking a game to one platform for a year isn't earth-shattering. Amazon does similar things with audio books and Kindle Unlimited. I hope they are very successful, and I also wish for GoG and other platforms to be successful. I finally took the plunge and installed the Epic client just so I could get Operencia (as I'm a sucker for dungeon crawlers).
Nothing terrible, just lacking functions I'm used to. I'm sure they'll add them over the next few months/years. Steam wielding such power over the market is bad for all gamers and the developers, too. More options lead to more games, better games, more options (like adult games) and better deals.