https://www.versobooks.com/

Explicitly lefty publisher, but the ebooks are DRM free and they include them for free alongside any physical purchases. (They do tag the ebooks with your name and email though.)

It can also be used as a form of semi-covert harassment. For example, in an early instance, every bit of content posted by or in support of transgender people would get hit by a barrage of downvotes from brigaders using otherwise inactive accounts. Hard to moderate that without just disabling downvotes entirely.

They also originally thought they’d have it update in real time which was a bit of a mistake. When you’re running a small test instance it’s kinda neat if comments and posts pop up as they’re made, but the reality of that is a scroll jacking nightmare.