The problem I have with dearrow is that it's editorialising and arbitrary. It's not like removing ads which can be clearly identified and the user can make personal decisions, like no sponsors but self-promo is fine, or whatever.
No, there is one alternative title and one alternative thumbnail, and that's it, and often I have serious disagreements with the choices the community makes. There's a bias towards intervention, so if a title is fine according to me but someone else doesn't like it, then it gets changed. I found most of my votes were to restore the original title and thumb. Eventually I got tired of it and just uninstalled, and presumably so did other people with the same feeling, so the community continues to skew towards changing every video they encounter.
Also, the thumbnails and titles that creators choose tells me a lot about them, and I get rid of clickbait by not engaging with creators that do clickbait. Also, sometimes it's not clickbait, just people being creative. It seems like the whole thing is just an exercise in being the fun police by people that don't understand the creative process.