crowbcat's video did an absolute number on B4B. The month that his/their video released, L4D2 enjoyed a player bump of +4.5k players - about 3/4 of what B4B's entire player count* was at the time (*according to Steam Charts, take with a grain of salt). Meanwhile B4B continues to hemorrhage players month after month. I'd be surprised if this game is still alive this time next year.
I just don't get it. IMO, B4B is the better game. Subjective i know, but L4D is just a bit too mindless shooting.