@eieio That reminds me of Pixelflut, which you can often find at (German? European?) chaos/hacker scene events!
Basically the same thing except with colored pixels, only bots and very fast. I don't know what typical bandwidths are, but here's a picture of the canvas at #GPN22 that shows 130GBit/s incoming on the server.
See https://entropia.de/GPN22:Pixelflut for info about the network they had at the event!