Yeah, YouTube's UI lets you set where the ads go. The creator tools let you set how many, and where midroll ads will play. However, most creators just click the "insert automatically" button.
> However, most creators just click the "insert automatically" button.
That seems like a good opportunity for a neural net feature that's smarter than simple scene cut detection. While most theatrical films lack many good spots for commercial breaks, there are certainly a lot of "less bad" spots. Sadly, I doubt YT will bother since they no longer seem to care about viewer experience in recent years.
https://support.google.com/youtube/answer/6175006