Yeah but stop and think about how little bandwidth it still is.
X and Y can easily be 2 bytes each, 4 bytes total. 100 samples per second is a mere 400 bytes per second. You could do it from a dialup modem from the early 90s!
Well spotted, and in reality it would more likely be 4096x4096 plane, encoded as 12 bits + 12 bits = 3 bytes. And probably 30 FPS giving 90 B/s. So the only problem is how often you want to send those packets, but the bandwidth of the cursor data becomes completely irrelevant.
