TSMC isn't a monopoly. You could go to Samsung like Tesla did. People weren't bringing monopoly worries in 2018 when Intel shut down their first disastrous attempt at being a foundry after about 5 years.

What you're seeing now is an "offer you can't refuse" to the fabless designers to direct private capital to Intel by the US for national security reasons and some political points. It buys Intel cash which it desperately needs for its foundry efforts and is a quasi-bailout of Intel shareholders and debtholders. The problem is that Intel doesn't know how to be a foundry in terms of volume and breadth of customers and will need an indefinite amount of capital to learn.