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The ones I've seen are from in-video ads (where the YouTuber themselves have a sponsorship deal and dedicate a part of the video to it).

American, I see them on TV and on the internets regularly, and have been for at least 5-8 years.

There was a MMA fighter on YouTube that I used to watch that would hock this crap. Would you like to guess why I stopped watching?

Not that I’ve seen, but at this point my targeted ads are all industrial products.

American here, have not seen this in my many corners of the web.

Scott Disick (of Kardashians fame) gave them quite a bit of American publicity a few years back.

I haven't seen them very often but I'm sure I'll get targeted ads now!

I see this a lot browsing FB from France (with en locale though).

they were on facebook for a couple of years in "sponsored ads" boxes that pop up in the feed. I think I blocked them after a while and never saw them again.

As far as I'm aware, yes

I see them all the time.