I've seen a Linus Tech Tips video where the seekbar was very colorful due to SponsorBlock, someone added all the sponsors, product placement and tangents into it.
I admit I've marked segments on videos, e.g. skipping cringy jokes when I find the presenter annoying.
To clarify, are you saying that these segments were marked incorrectly?
If so, then it is a plain case of internet vandalism. I would just ignore such segments.
But if the segments were marked correctly and there were too many of them in the video, that is the problem caused by the video creator, not by the community which publishes the segments.
They were marked correctly, but I had a feeling someone was sufficiently annoyed with all the fluff in the video, that they went to the trouble. I think it was the only time I saw an LTT video with that many SB segments.
I admit I've marked segments on videos, e.g. skipping cringy jokes when I find the presenter annoying.