It was absolutely terrifying and we should all be collectively ashamed for allowing it to persist and to happen in the first place.
Here's a random example I just found on YouTube (first 30 seconds): https://www.youtube.com/watch?v=DXzR3-w3vEQ
They can ask to use yours, though, which is what most kid-targeted advertising looks to cause.
Some of the "kidfluencer" content out there is clearly aimed at giving kids talking points to bring to their parents. Before we banned YouTube from the house a few years back, I had a couple experiences where my kids would come and give me canned marketing copy - "it's fun and educational for the whole family!" sort of nonsense - they'd clearly cribbed off a video.
One specific example of this I can remember: "EvanTube". Started off cute and relatively non-commercial, but turned into very clearly paid marketing. https://www.fastcompany.com/3045807/meet-the-father-son-team...
Kids today get crazy ads on Instagram and are asking for Supreme shirts, Yeezus shoes, Kylie Jenner makeup kits.