Games hardly eat up more than a megabit of bandwidth in practice, unless you start streaming. Even streaming games from the cloud to your computer will usually take less than 20-30mbps.

Latency is the real killer, though. A 10ms round trip + a few ms of simulation time at 144Hz will have physics objects "correct" their position after 4-5 frames have already been rendered. Bump that up to 30ms (still a perfectly common amount of latency) and you're reverting objects after 10 frames of animation.

The true killer is latency; the dominance of WiFi, and now the rise of home 5G internet.

People who play Counter-Strike with their wifi router 3 floors below them in the basement under a pile of laundry will go on a crusade to complain as loudly and relentlessly as possible for Valve to "fix the fucking hit reg".

People have -zero- technical knowledge and get incredibly angry that they died to someone they didn't even see.