Most of the companies you’re mentioning do not have their own chip foundries. The only - and I do mean only - companies that have working lithography lines to support bleeding edge chips at massive scale are Samsung, TSMC, and Intel. Several other companies are investing in eventually gaining that capability, but right now, thats it. And these things take a LONG time to spin up and iron out the issues.

TL;DR: the problem is how few companies actually MAKE the chips, not how many companies DESIGN them.