What makes Nextcloud unreliable for your use case? I’ve used the calendar (caldav) functionality for years without issue in sync.

Tbf to cloud sync, nothing is stopping you from using your own backup/restore service with your drm-free titles compared to the other features that Galaxy offers.

GOG has DRM for many titles: see Galaxy. As I understand it, it isn’t as pervasive as Steam, but is necessary if you want multiplayer on many titles or care about extras like achievements.

I am not sure if jest, but you could always take a few seconds at protondb to see that yes, all of those games do in fact run on Linux. Forza in particular seems to have issues for some users, but everything else works with minimal hassle.

The desired alternative is not Matrix simply because privacy-conscious, open-source ecosystem vs. proprietary solution is not the goal. Matrix would still generally be terrible for support. What people want is publicly searchable content that is ideally indexed like a wiki. Many will happily settle for issue boards or even forums though. Discord has pathetic search capabilities in comparison to any search engine and has no way to properly and publicly backup information that is posted to the platform. With a website of any kind, one could clone the site for mirroring or simply get a web archive service to crawl relevant sections.

VideoLabs is made up of many of the same contributors of VideoLAN, including Jean-Baptiste Kempf themself. It is arguable that this is in fact Unity banning VideoLAN’s VLC bridges for media playback in Unity.