They're on a dark path, when I signed in using a different device (on the same home network) it triggered a total block on my account that required adding an email address.

old.reddit.com still works, but the day that site goes away is the day I stop using Reddit entirely.

Probably for the best. Quality is nonexistent vs a decade ago.

What's a good alternative though? I tried Lemmy a while back and whilst FLOSS communities there were pretty active, others not so much.

Only reason I use Reddit these days is for r/sysadmin and r/SCCM, lots of useful content there that saved my bacon on multiple ocassions - especially on Patch Tuesdays. Haven't seen this sort of active userbase and content posted anywhere else.

I have Lemmy set to show best of the last 24 hours and there's always a page or two of posts. That's plenty enough for me

Unless the GP post was edited after your response, you've basically ignored the whole second paragraph.

Enshitification of Reddit continues unabated.

This is pretty short-sighted, considering that there are mobile devices out there that do not have an official Reddit client, such as all the various Linux phones.

For me it worked by turning the desktop mode on.