This was a very interesting read. It also appears to be quite a controversial one, judging by the equally interesting debate raging in the comments; I get the impression this is a topic that a great deal of technical people care very passionately about.
It seems that those who are against what you're saying are proponents of a developer-centric utopia; one where all source code is widely available to the betterment of mankind. They see this as the antithesis of profit-driven corporations & big government.
This is all well and good but personally, I'd rather we strive towards a different kind of utopia; one where governments are efficient and moral enough to regulate corporations and big tech effectively.
Does "free software" contribute towards this? It doesn't sound like it. The onus of source code verification shouldn't be the burden of the tech community, software is too integral to society at this point and as such, it seems to me that the discourse is more harmful than helpful.
Regardless, it's a fascinating topic and I've found the debate sparked here has been incredibly educational.