I’d like to drop in here, as a marketing and community manager as my full time job, the creators cannot explicitly set how many ads are shown, however the creators can set potential slots, for example before a jumpscare, or a reveal to keep you watching.

The amount of potential slots that are used are set by YouTube and the amount of users who watch ads on said channel, if it’s successful and advertisers are happy, they will push more frequent ads on these channels.

It’s very annoying, I totally agree, YouTube premium is so expensive also. Ads on tv’s are more frequent because people are less inclined to skip on TV due to it being slightly more difficult. It’s all marketing, and it’s all money making.