It seems like the only harm is that I won't see/click the ad. But I think anyone who runs an ad-blocker is already the sort of person who won't click ads. Even if someone advertises something I'm super excited by, I'll want to take a few days to research the product - and I'm not going to go dig up the sponsored link when I decide to buy in.
And, I can't tell you what the difference is- it seems it would be the same- but sponsor spots in audio-only podcasts bother me more than ones in videos. Maybe it's the length. The majority of the content I watch keeps sponsor stuff short- but the podcasts I listen to make a 5-10 minute infomercial out of them, so I do skip them more often in podcasts
As far as whether I think there's any harm to creators from skipping sponsored spots, it's possible that whatever statistics/analysis creators have access to on the platform might inform what they're able to tell their sponsors as far as views/etc. - but I don't know to what extent that goes
Me too, I just think it's gotta be an either or.
The ads that are baked into the video don't have tracking code because they're just part of the video file, they aren't an extra javascript burden, often the sound/transition is far better and not so jarring-- really they're IMHO the least "bad" form of ads- better than the alternatives in almost every way- and often these ads are more relevant to the content and probably support the creator well.
I would much rather have a creator do sponsor spots in their video content than ever get served a javascript ad from some ad company.