Oh, certainly, the 10k users can’t. That’s why I’m not talking about that. I’m saying that instead of looking at the number of users, just the fact they have a 400k lines codebase suggests that they must have enough money to hire a team that builds that (or had, at some point in the past).
Maybe so, but not necessarily. I have a couple of 300+kloc projects that I wrote all by my lonesome. It's far from an impossibility. On the other hand, there's a reason I only have a couple of those.
