I've said this before elsewhere but I still stand by it: for the most part you are attributing to malice what is ultimately incompetence. Because these "Devs" are comically incompetent, it's a bunch of horny basement dwellers with no discipline, no bosses to oversee them, no stakeholders to be accountable to (patrons don't count, they're more than happy to pay for nothing) and no real professional skills, be it coding, art or project management.
Sure some creators are scammers, some even admit it, but most are just hopelessly incompetent.