Those 100m are not destroyed by burning them in an HFT furnace but rather used to pay developers, hardware, factory workers etc. Sure, it's not going directly into infrastructure but it is not lost.
In fact, it's quite possible that if it wasn't invested into HFT it would be held as cash by the company or paid out as a dividend (which is fine as well).
In fact, it's quite possible that if it wasn't invested into HFT it would be held as cash by the company or paid out as a dividend (which is fine as well).