If we just write them a check, they'll do whatever they want with it. They need to be held accountable, and ownership percentage is a way to do that.
Alternatively, the gov could take this money, start up a corporation of their own, and make their own fab. The language in part of this bill is that they are trying to ensure that older tech and DoD stuff is made in house. So let's make it in house.
We don't necessarily need to say "we're buying intel or nvidia", but we can make the money available to any company in exchange for the ownership percentage. That eliminates the "playing favorites" issue, I would think.