The problem is that people like us use Homebrew (and tell our families to), so there’s little incentive to complain loudly about this issue. Browser extensions and the occasional one-off app are the only reasons to go there.
Nonetheless, a critical engagement of software "safety" would require another few thousand words, at least.
If you have a point to make about it being particularly unsafe or different from any other internet/software trust, make that point. Otherwise you know well enough that there isn't any other option but trust, and people generally trust stuff until given a good reason not to.