[chetanahuja]

We run our infrastructure on public cloud but almost our entire stack is cloud agnostic (except for a particular big database service we use). So our serving nodes are distributed across many public cloud providers and we can make decisions based on location/cost etc. in different regions of the world.

The rule of thumb I've heard is that you should start looking beyond public cloud once your cloud spend hits ~200K/month. Since at this level, engineering and ops investments you need to make to maintain your own infrastructure start making more sense. I think it's safe to say Snap is beyond that threshold right now.