Every part of the project went not as planned. Most bright example is billing. I was initially implemented everything using PayPal preauthorized payments API and only going live it appeared that this API only available to merchants with personal account manager, and to get one you need to already accepting more than 2500$/mo in paypal. So I have to re-implement it. And not only billing as subscription management also depends on billing. Then getting many IP addresses for outgoing proxies appeared to be much more problematic than I was expecting. Answering the second part of the question. I use it for my other project where I need to pull data from many websites on a daily basis. And I use it in my browser to change IP location and avoid country level blocks. I hope that eventually I can convert it into more or less profitable project, but the main lesson I learned from this is that when something looks simple it doesn't mean it simple in reality.