Pretty much every Youtube channel has at one point or another failed to disclose advertising. For a good while they were all doing it and sponsored videos containing sponsored content were entirely undeclared. Its a lot less common now presumably there is some enforcement now but I still see it quite often.
I disagree that that standards should be higher - just the penalties. Small YouTubers shouldn't be able to get away with being corporate mouthpieces without declaration just because of their size.