At one time, Reddit (or at least the core server) was open source. Statistically, it’s relatively likely that someone, somewhere forked and is maintaining that code for their own purposes to this day, but I’m not actively aware of any examples.

If someone has been maintaining a fork, I’d love to see the old comment database imported into it and made available, though I don’t know offhand what license either the code or the comments were released under.

A FOSS Reddit, without the chaos that took over America during the presidential administration installed in 2016, and branching from there, would be an interesting point of diversion to say the least.