Are there some 0s missing? $500K doesn't sound like any amount of money to open a "mature" trading platform.
On the Bitcoin Software Maturity Scale, where hundreds of thousands of dollars routinely gets entrusted to 17 year olds coding bucket shops in Ruby on Rails and 80% of the global transaction volume is run through a company in Tokyo set up to trade Magic: The Gathering cards, a guy with financial industry and experience and enough money to pay for a single professional security audit is practically IBM.
Ah yes, that scale that's numbered from 0 to 0.8 and then back to 0.7.