I do that kind of thing, yes. Although I usually find it so distasteful, that I lose interest in watching other videos anyways.

But yeah, especially when it's a channel making educational content, there's a chance that some viewers take the sponsored section as general educational content (no matter, whether that's because they're gullible, young or did not pay attention when the sponsor segway happened).

There's also various tech channels which recommend products that are objectively worse than the alternatives, or even exert malware-like behaviour. Those also immediately lose any and all respect from me.

Obviously, if it was a genuinely good product, it wouldn't need the sponsorship deal for people to make videos about it. So, I do understand the struggle.
But everyone wanting to make a living off of media has that struggle. If I artificially inflate the view numbers of one media creator, the others receive less sponsorship money.