Licensing also means corrupted busy bodies and gate keepers; it doesn't necessarily increase quality, but it surely decrease supply of service providers and give a rather dangerous power to a selected (by whom?) group

Yes, licensing does reduce supply compared to a free-for-all. But that’s the point, it filters out people who shouldn’t be doing the work in the first place. For engineers, the PE designation means you’re legally responsible for your work.

Who's more trustworthy, the IEEE or Mark Zuckerberg?

yup, the completely uncorruptible and good natured CEOs like Zuck’s of this world should be running the show, that’s gotta be good for SWEs :)