I think games that are heavily reliant on online pvp are just always going to struggle with being more niche appeal. Matchmaking is hard to do well and consistently, and managing the skill/progression curve is hard— there's gotta be things in there to master, but also new players will never join if they're just getting stomped every game because they can never catch up.

This tension has arguably been a contributing factor in the collapse of the ARC Raiders playerbase, with a huge population who joined primarily to shoot and loot the robots eventually confronting the realities of a pvpve game, and peacing out for good after getting shot in the back or ambushed too many times.