I watched a Warframe (game) YouTube video on the Steam integrated browser, without beeing connected to my account and Holly s* it was horrible.
In a 14 minutes video, I got 5 ads. 1 (or more skippable once) at the beginning, 1 during the first half of the video, 2 during the second half, and 1 at the end.
All were skippable after 5 sec.
2 were close together at about 1 min interval during the second half of the video.
But that is not the only issue. 4 of those ads (not the last one at the end), were Israeli hate/war anti-hamas propaganda.
I consider these ads horrible and they should not be allowed in my opinion.
The reason your ads are of terrible quality is because it doesn't know who you are. You're not logged in and it doesn't have any cookies to go off. If I open an incognito window at work and watch a YouTube video it is HORRIBLE. Get rich quick schemes, cheap Chinese scam products, etc. There are a tonne of employees behind this IP and it's a blank slate browser, so they give untargeted ads.
Think of it this way: Tech companies want to know everything about you, why? Because it helps them sell you for targeted advertising. If Dove wants to show their shampoo commercial to women age 14-30 then Google will gladly offer that for a price. Untargeted ads are literally bottom of the barrel ads and can be considered the "junk mail" of advertising. That's what you get when you use YouTube without an account. It's honestly despicable what Google will allow to be sent out in this category and it's clear they don't do any human reviews before approving the ads for distribution.