Which raises the question of how Yidden can rely on *any* hechsher on a non-Jewish food product considering that even inadvertently placing a kosher symbol on non-kosher food products can and do occur.
Things can always go wrong, no matter who owns the company, but halacha allows us to rely on rov, chazaka, mirsus, etc.
You’re fooling yourself if you think the heimishe hechsherim only certify food which comes from Jewish owned factories. That’s not to say that some heimishe hechsherim aren’t better in some ways than the national hechsherim (some hechsherim with Hebrew letters OTOH are horrible), but it’s only a matter of degree. If you buy any processed foods, you’re relying on an assumption that nothing went wrong.