So are you saying the mobile network you use is absolutely terrible and you have a signal less than 99% of the time, or are you saying that if a blog you read fails to load one out of a hundred times you visit you stop reading it?
No signal for more than fifteen minutes every day? That must be frustrating.
But there are other factors such as battery dying or just dropping the phone.
Neither of these has happened to me. If they did, the uptime of my personal blog would be a much lower priority than fixing that problem. It's a blog, not a business.
Q: "How will it handle scaling to millions of users?"
A: "By crashing. But it will handle 100s or maybe even 1000s, and you currently have 3, so chill."