Technology

An interesting component here is that it's possible that the video creator is responsible for this silly level of ads, but it's impossible to know. Creators can select points in the video where ads will happen, which they can use to preserve the video's flow as much as possible. In theory, you can even select to not monetise your video at all, which is a useful tool if the topic is something particularly dense or sensitive. In practice, I've seen plenty of creators apologizing when an inappropriate ad plays at a sensitive part of the video, despite them having tried to disable ads on the video. It must suck to have so little power over one's own work.

In your case, I suspect this was a creator choosing to maximally monetise their video, given the regularity and number of ads. However, it's possible that this is a 100% "Fuck Google" situation, given how opaque they are. I find it frustrating that when we have poor experiences like yours, we don't even have a clear target to get angry at. It leads to accountability so diffuse that it's like homeopathy. Getting angry doesn't necessarily help change things (at least individually), but it can be incredibly cathartic even then