Snow White was the 3rd highest selling VHS (not Disney VHS, in general) and either in or at least around the top ten highest selling Blu-rays depending on what source you look at, so probably those people. It also rereleased in theaters like twelve times all the way through to the 90s. Not sure what the streaming numbers are, admittedly, but the heavy switch to streaming is pretty recent, all things considered. Even if we presume no one streams it, that's pretty strong evidence people were watching it recently enough for young adults to have nostalgia for it.
I really don't understand why people suddenly act like we never moved past the "movies are in theaters then disappear" phase of movies when it comes to Snow White so only old people have watched it. Especially since you never hear this stuff for, like, Cinderella. 75 year old film is okay, but 88 years old will obviously only be watched by the elderly.
I do agree no one actually wanted this, though.