FWIW, I find AWS limits confusing and seemingly random. Also, the fact that you can't limit total spending is _very_ unfriendly to (at least indie, as you point out) developers. I have no experience with DO though, maybe that will change with this offering.
Have you actually dealt with their support though? Your example of going from (seemingly) zero servers to 17 across 3 continents in 24 hours (indicating unforeseen absolutely incredible traction and growth) seems significantly less likely than getting a response from their support team increasing usage limits within the same timeframe.
