I don't know about that. All the PhDs I know are dirt-poor (or were until they left science to get tech jobs), and are in the game because they are passionate about science and the project of advancing human knowledge.
It's true that your ability to get a tenure-track position is very dependent on your ability to successfully obtain grant money, but most of the scientists I know view that as a necessary evil, not the game in itself.
> The only useful science done at the moment is at tech companies who will use it to build better products.
This is trivially demonstrably false. https://en.wikipedia.org/wiki/James_Webb_Space_Telescope for the first example that came to mind from recent news.
I’m sure the original claim can be narrowed even further than you just did to make it true; I don’t deny that there is a trend for more research, particularly CS and biotech, to be done privately. It’s hyperbole to claim academia is doing nothing though, even in CS.
I could leave for industry tomorrow and likely double my salary.
The money I've personally earned from grants is... $0. And I've been very successful in getting grants.
I only got a job offer at one university where the PI of a grant directly got a monetary benefit from it, and while it was nice, it was never going to be more than "That's a nice little bonus" money.
If you want to make money as a scientist in academia, consulting or a startup is where it's at.
I doubt that in the general case. People have always been driven by base selfish motives.