We've also seen a rise of VC-backed research startups (like DeepMind but many others) whose value proposition (to the VC) only makes sense if the goal is to demonstrate a research capacity to get them bought out by a big company, or as a moonshot to out-compete them on an actual product made possible by the research. Investing in these little research startups themselves is also giving companies a way to push research without having to deal with having the researchers as direct employees, and I'm sure makes some of the startup employees feel a bit safer since there's a separation of money and operation influence. One similarity with modern academia is it selects for those who can do good work but who are also good bureaucrats (write grant proposals well, advising politicians, etc), startups have a selection for good work + good at courting VCs. But the startup just needs a few of them, then they can hire people who just want to do good work.
Another thing that makes corporate even better is they can occasionally spin off research developments into products, they can have some nice advances that only come when you try to productize, and among other reasons by not having to bother with external publishing (which takes time + fights with lawyers and business people) they can routinely be 10+ years ahead of whatever the state of the art in academia is.
As for 'needing' PhDs, I'm not sure. Having some can be convenient, yes, but in many cases not necessary. In some fields the only way to get caught up (i.e. no corporation will train you directly) may be with academic foundations but is a PhD necessary or just some relevant graduate work?
As an example N=1 to show a PhD is not needed always, Jeff Jonas formerly held the title of IBM Chief Scientist where he did some state of the art work in entity resolution. He didn't even finish high school.
Further, since your original position was strongly that academia is useless, it is your onus to back up the implication that PhDs are not (generally) needed/useful, and using "well hmm, not sure if absolutely necessary" logic is fallacious and clouds the issue.
When too many of those really stupid investments go belly up at once, it's called a bubble popping, and it is catastrophic to the economy.