But its doable, but basically a boring thing to do

Since we cannot minimize the autobet and we need to keep watching the screen while autobet is running.
You don't have to necessarily watch the screen for the auto bet to keep running. What I usually do for the auto bet to continue if I plan on multi tasking is to have it on a seperate window it should continue as long as you let it run on the back.
That would probably take years to make 1 billion bets if you're making 1 bet per second, i don't think someone would waste their time just to make a billion bets.
It would take 30+ years since the delay could be more than 1 second and making 1 billion bets just for the promotion doesn't help when you're competing against so hundreds of gamblers.