So a better title would be "51% of Gen Z women mostly search for memes and videos as opposed to information".
I search YouTube for many of the same reasons while I'm not Gen Z. Video responses allow me to listen while doing other things, to get a quicker sense of relevance to what I'm looking for, and produces faster answers than plain Google search does. In addition, I get sent down the rabbit hole in directions I wasn't expecting far more often than I do with plain Google search, which can be very enjoyable/informative.
YouTube is about hosted video search, as opposed to a general search engine, but is content neutral. It has anything from people lighting their farts to treatises on existential philosophy, and from hardcore science to gamelan performances.
TikTok, is, to put it charitably, not that content-neutral.