I think most people just scroll instagram or tiktok. Because of lack of short content format earlier, mobile games became popular. That and lack of 5g infra. Both problems have been solved.
You didn’t need 5G to stream video. You could stream video well on “3.5G” with the enhanced GSM protocols
You kind-of do need 5G to stream video on public transport where every one of the other thousand people on the line is also trying to stream video. Even LTE suffers from fundamental contention issues once you get to Tokyo/New York/London metro levels of device density.