looks like rendering adblockers extensions obsolete with manifest-v3 was not enough so now they try to implement DRM into the browser giving the ability to any website to refuse traffic to you if you don't run a complaint browser ( cough...firefox )
here is an article in hacker news since i'm sure they can explain this to you better than i.
and also some github docs
Nah its part of the markdown specification
That's actually a bit of a relief to learn. I didn't want to believe it was simply because Lemmy was trying to copy Reddit, but I just didn't know enough to see any other reason.