alt Hacker Newssimilar observation here, with a 2.33-year old. In small doses we've exposed him to videos[1], never unsupervised, never as a parental substitute, but there are a class of them (which happen to be the lowest-effort, highest-contrast, most insipidly soundtracked CGI dreck I can possibly imagine) which are absolute baby crack. He watched some a few months ago and now he can't get them out of his head. It has gotten to the point where we are simply at a hard "no" about any videos because it always devolves into an inconsolable tantrum tearfully begging for more video crack.
[1] kid loves trucks and garbage trucks and trains, and so for a while it was fun to pull up a video of real life trucks and trains and watch them and talk about them. We'd read a book about trucks. He'd point and say, "what's that do," and I'd explain, then say, "wait! I can show you." Which was fun, until it became triggering.
we had generally the same experience but with disney princesses
was sort of a crutch for a sick kid or when things were slammed (e.g. kid 2 or 3 was also sick or we were otherwise busy) but we had to limit them heavily.
we also made the mistake of playing her the soundtracks, which ended up with listening to Aladdin or Frozen on repeat. All told not bad music compared to the drek they're putting out on YT now...