For the curious, the original was actually /r/195 on Reddit. It started as a joke between some college roommates, in dorm room number 195. Then it eventually got popular as a sort of shitposting community. But the original 195 was basically unmoderated (because it was just a couple of dudes in college who started it for shiggles,) and was eventually brigaded and taken over by alt-right neonazis. The memes quickly devolved into straight up Nazi propaganda.
So 196 was created as a sort of “new” 195, and that original brigade and subsequent takeover is why a lot of the 196 memes tend to lean hard left. The 196 sub was sort of a rebellion against the 195 takeover, which means that conservative stuff quickly got shut down. It eventually became a sort of safe space for transgender memes as a result. From there it became a sort of self-sustaining reaction where trans people saw it as safe so more trans people gravitated towards it.