I finally peeked at the reddit thread about Subnautica and the Epic Games Store:
I don't know how much is fear mongering and how much is legitimate concern, but there are some potential issues and one nice thing (besides the free games):
- apparently you have to opt out of marketing emails (so you must check a box to opt out, as opposed to, say, Humble asking you to check a box to opt in), which seems to run afoul of GDPR
- Epic may send your personal info to other countries where data protection may not be as strong (assuming your info doesn't get hacked, which obviously moots any assurances), Tencent gumble China grumble, use a throwaway email and prepaid cards, etc.
+ Subnautica is DRM-free, so you can run it without the Epic launcher (copy the install folder elsewhere, as it gets deleted with the Epic launcher)