I actually know exactly how I am going to acquire those 10m users. LOL good luck with that. At that scale, the technology stack is the least of your worries.

I actually know exactly how I am going to acquire those 10m users. LOL good luck with that. At that scale, the technology stack is the least of your worries. That billing issue that affects 0.01% of customers? At 10M users, that's 1000 instances of the problem!