Of course, and that’s why European Youtubers will sometimes upload video in 4k@50fps (because the grid frequency in Europe is 50Hz instead, and that’s what a lot of cameras are configured for to prevent banding).

Syncing with the power grid is one of those great ideas that lead to some very silly side effects, like that time the grid frequency in Europe sagged for a while and everyone’s alarm clocks started drifting. Grid operators increased the frequency slightly over the following months to correct the clocks as well, so if you adjusted your alarm clock you’d need to adjust it again!