Clickbait Remover extension may help you https://github.com/pietervanheijningen/clickbait-remover-for...

Or you can write a userscript / custom CSS to hide thumbnails altogether.

Or you can browse YouTube through RSS feeds (which afaik still work).

I think that sounds good compared to now, but if it actually happened, it would lead to a lot of unintended consequences.

DeArrow is an extension by the SponsorBlock guy that does this.

The extension dearrow will do that