There was non-stop railing against capitalism and pro-socialism cheerleading in that sub, so your conspiracy theory is a poor one.
The reason the sub is getting lots of coverage is because it has exploded over the last year, and because it manages to present its ideas in as poorly a light as possible.
Serious question is is pro-socialism for people to complain that billionaires keep getting property tax breaks while normal working people keep seeing their property taxes go up in part to fund them?
Anti capitalism and pro "socialism" aren't actually hard indicators of marxism, believe it or not. There has been so much political distortion that circles who use those terms are, more often than not, filled with liberals rather than marxists.
And often times that's what some of us call the synthetic left. Groups of so called leftists lead by think tanks, NGOs or even historically by intelligence agency agents whose sole purpose is to spread disinfo, deradicalize or confuse people all while using a radical aesthetic.
The reason the sub is getting lots of coverage is because it has exploded over the last year, and because it manages to present its ideas in as poorly a light as possible.