Patio11 is one of the most responsive public internet users out there. On twitter, he’s not the absolute most responsive, but he has a standing invitation for anyone to contact him about nearly anything on his website, and he takes it very seriously[0]. I know multiple people at Stripe who have been asked to look into things he’s found out about, and he follows up. I won’t claim that he’s perfect about this, but I struggle to come up with anyone at any company of remotely similar scale that is more likely to do this.
Disclaimer: I’ve somewhat recently gotten to know patio11 a bit, but he’d previously responded to my tweets and replied to my emails, long before our paths actually crossed.