I've been building out a very large network of reverse proxies the last year. Very fun, and your article is very relatable. Go has been my friend. Been spending the last couple months testing trying to figure out all the weird things that can happen and its quite a bit.
A sort of boutique mobile-first proxy, with emphasis on geography spread/accuracy. I've been running my own proxies for a long time via friends and families networks, but in those instances security/safety wasn't as big of a deal. Yourself?