similar 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.