I commend Kagi on this idea and absolutely think this should be available for all users.
First of all, all users are susceptible to shock thumbnails and clickbait titles. At the very least this results in wasted time. Given that Kagi is a search product, it should strive to make the search as efficient and effective as possible, and these measures for video are ultimately about making video results honest and relevant. Misrepresenting video content is no different than misrepresenting text content, and you have taken a very firm stance on trying to steer search users away from textual content mills with poor content (they too are "impacted publishers"!), that are only there for the money that comes from clicks, and these features are a step towards achieving the same standard for video search results.
Also, a fair number of high profile YouTubers have come out explaining that they do the clickbait title / shock thumbnail themselves because they are in an arms race and have little choice to do otherwise. These features that you rolled out apply equally to all video results and therefore it is hard to label them as unfair for creators when they are all subject to the same filter. I suppose they are a little unfair to the lowest rung of bottom feeders that know nothing except how to produce thumbnails and clickbait titles and whose actual video content is nothing short of abysmal and irrelevant.
Finally, I would like to comment that your "summarize video" feature is a nice secondary filter that helps users test for clickbait content - specially for shock content, a summary usually disarms the clickbait video pretty effectively. I would not label it as a primary protection due to the time investment required, though. Perhaps for video search results specifically you could consider making this feature more prominent, making the user more aware of it.
