Nginx is fast, but I think that’s asking too much of it.
Of course that problem hasn’t happened yet, but it’s what I’d be worried about.
So using nginx in a 1 Gbps server is definitely not asking too much of it, or I might not have understood your comment clearly.
Why would Facebook decide to use my tile server? When a company's business depends on having reliable map tiles, they either self host or have an Enterprise deal with Mapbox, etc.
It’s interesting to know that the limiting factor is bandwidth and not nginx/disk speed though. I’ll admit I don’t see 30Gbit of map tiles happening any time soon.
The specific example you give is not going to happen.