YouTube seems to be pretty explicit that it is paying 55% of revenue from watching videos to creators:

> If a partner turns on Watch Page Ads by reviewing and accepting the Watch Page Monetization Module, YouTube will pay them 55% of net revenues from ads displayed or streamed on their public videos on their content Watch Page. This revenue share rate also applies when their public videos are streamed within the YouTube Video Player on other websites or applications.

https://support.google.com/youtube/answer/72902?hl=en#zippy=...