Maintainers: 2 months of inactivity on a FOSS project
Redditors: Yep, this is the end.
That's not an accurate assessment of what's going on. The post linked states "no contact with the maintainers" not just inactivity, and if you follow the github issues linked, it's about people wondering what's going on and if anyone else can approve pull requests because there's lots of pull requests waiting. There's 843 pull requests at this time, and I just looked and over 50 are from just the last month.
It's not that there's repo inactivity, it seems to be that this is an extremely active repo which saw everything grind to a halt when the admins went dark. That's quite a bit different then just "inactivity".
That's kinda overwhelming though ... imagine that if the maintainer pops up somewhere, suddenly 100 motivated people may chime in "hey please review this important pull request that's been sitting over here for a while".
There are some kinds of open source projects that are prone to this ... some are really not so bad to maintain if you have the right kind of discipline, because they converge on a stable set of functionality and platform compatibility evolves slowly, but some just naturally have endless room for variations and special cases, and as users increase, PRs increase linearly (instead of sub-linearly as you'd hope). I'm thinking in particular of https://github.com/oauth2-proxy/oauth2-proxy (of which I contributed to an older fork)