I totally agree. Unfortunately, there's two takes here.
On one side, the opensource-nature of the works;
on the other, the public funding / tax money.
This would mean *all* projects subsidized/supported/funded/yourbuzwordhere by tax money to be forcebly opensourced.
This is NAO in case of Stealth development, for instance.
And potentially against pretty much any NDA redacted on the planet.
Not only would this force private entities to refrain from public funding, it would (as a consequence) also (potentially) cause software to be NOT open sourced. Now, I do not know how big of a role public funding has in VC stages of, say, startups, but it's still money (and usually "good" money in the sense that the payback is alot cheaper, and no equity exchange is required).