I thought of making this a poll, but polls can't be edited. So I thought I'll add each choice as a comment, everyone can just like the comment to vote for that choice. If you think of some other option, just add it as a comment. Edited title: I'm not asking who puts out the worst ads for themselves, but which ad-based service serves the worst ads.
Toyota, Chevy
Please see updated OP
Amazon
Facebook Portal. They try way too hard to sell that garbage.
facebook in general
Please see updated OP. Where did you see these portal ads?
Samsung
Please see updated OP
eBay
Worse as ....in content/relativeness? Blocking core content? Loudness?
Could be anything really.
Microsoft, remember that first surface clickity ad, I never understood what they were trying to say.
Spotify
I voted Spotify myself, because as an English user in bay area I still get served Spanish ads sometimes (I don't have any Spanish songs), the ads themselves are often stupid with annoying soundtrack, the music/artists they promote often don't suit my taste (they should know my taste!), and sometimes the same annoying ad gets played 2-3 times in a row! It's like they're not trying to advertise for money in good faith, but rather they're punishing free users with their annoying ads.