Are people just now discovering that Reddit has run on full censorship for a long time?

Sure, and both were exposed to PARC and early 80s experiments in GUIs. There was a certain amount of convergence. But it is interesting that Windows was in motion first.

Bet it happens for political reasons. First rule of suppressing revolutions is to cut communications.

Interesting that Windows was in development before the Macintosh. To be fair, lots of 8-bit systems had experimental GUIs at the time as well.