I have a DO VM that I use for a few hobby apps but mostly for a Tor relay. $10/mo plan. I've done my best to throttle the bandwidth usage within the plan bounds but can't say for sure whether or not I've been entirely successful at that. Nevertheless -> zero fuss from DO, nothing, not a single complaint or $.01 added to my bill. I don't think I (or the Tor user community) would have fared nearly was well with Amazon.