If you design a webpage that looks like an app loading screen, and have to put the word "SCROLL" at the bottom, I think that's a design failure, for the same/similar reasons that "click here" links are.
"Cut off grid tiles in the view’s initial scroll position to communicate the scroll direction for content overflow."
https://m1.material.io/components/grid-lists.html#grid-lists...
Nudges can be helpful.