Do they? I've not seen that.

Because communism isn't synonymous with marxist-leninism. And even as a leninist, the USSR had several problems that aren't inherent to leninism. The entire way they managed the economy completely ignored the material conditions of the country and attempted to brute force a jump to communism by bypassing both capitalism and socialism to different extents. That's why china started working after Deng, the party realised that the productive elements of capitalism can be useful in building socialism when there wasn't the creation of excess by capitalism as assumed by marx

I think the algorithms have determined that you'll engage with videos about people who want communism.