Ah, ACM, I can't think of a more deserving target to get shafted!
I think the key for you will be moderation, $7k in 30 mins is going to be like waving a red flag and you
will be closed down because it's their money you're scalping. Try to avoid the temptation to make as much money as quickly as you can, intersperse your scalping with regular trades if you can, blending in will reduce the chances of detection.
You're not the first to exploit latency and I don't doubt there are those who make a good living from it, the long-termers I expect have mastered the art of appearing innocuous
From an ethical point of view though it's
unethical, there are unwritten rules that professional traders and brokers adhere to in order for us all to make money, there are endless tricks that brokers and traders can play but it's better for us all to play 'fair', that way we all make money and everyone's happy. Personally I prefer my broker
did protect himself and close down these types of traders because it means they'll stay in business (nothing personal you understand!)
Good luck with it all the same
Cheers
Mick