The problem isn't the ads themselves.

The problem is that YouTube's monetization setup encourages content creators to stretch, expand, tease out and otherwise bloat their content in order to achieve returns. It turns 20 seconds of hard data into 18 minutes of sawdust that you have to either sit through or sift through in order to get what amounts to three sentences worth of typed out information.

Sometimes content creators are kind and they label things and "separate" them into time indexed segments, but even then, I read much faster than they talk and every single one of them I've run into still rambles around in loops of opinion, sentiment, and anecdote while doing so.

It's an absolutely awful last resort for getting simple answers to direct questions and it's so very, very much worse than even WALLS of aimless text would be, because at least text can be ctrl-f'd.