In my persional experience online gaming is <50mb/hr. Zoom meetings, meanwhile, are basically a bunch of concurrent livestreams. I would rather say that online gaming is a rounding error compared to WFH and streaming.
Depends highly on the game. From what I've read, most multiplayer games use around 80-100 megabytes/hour, but I've read numbers as low as 50 and as high as 300. A Netflix 4k video stream has a bitrate of around 6.75 gigabytes/hour, and a Zoom call will use somewhere between 500 to 1500 megabytes/hour for a one-on-one (and somewhat more for group calls). So work-from-home is an order of magnitude more bandwidth hungry than online gaming, but still reasonable for a country with good Internet infrastructure. High quality video streaming is the real killer indeed.