It only sounds good in the news, in practice it is a money pit, not a competitive advantage. You only do it because of national security.
Knowledge transfer is key.
Naturally TSMC knows their tools and processes, works with product companies (nvidia, AMD, Qualcomm) to actually implement their design on the target process node. And at the same time works with the various tool vendors to refine the process, the tools themselves. But as lately we saw it's increasingly impossible to do it "alone", both Intel and Samsung works with many-many vendors. (Intel - among others - funded the push for EUV by buying ASML equity in 2012.)
I did and mine will soon run an article series in all of northern Germany to educate business leaders about electronics, innovation and how that'll create jobs and lucrative patents.
It was some work for me to collect statistics and experts to cite, but I expect it'll help my business too by increasing demand.
I went with industrial cameras as the example product because they have a market yearning for innovation in factory robotics and optical AI.