The OP doesn't seem to work there and seems like an outsider who thinks he knows how to run a company better than the people on the inside. This obviously misses a lot of moving parts and internal incentives (which yes may ultimately created a bad product). But I'd personally rather hear the experiences of people directly involved with the company.

I don't see anything wrong with training people on their tech stack either. That's not a scam, that's a highly valuable skillset if it gets you a job and experience. You can always learn other languages on your own, which is 10x easier after you know one.