Remember that you're getting 5x the compute resources for the same money. You don't need to autoscale as much. You're not fighting crappy EBS performance. You're not architecting around remote-network RDS databases with milliseconds of RTT. I firmly believe that for most applications you're going to be better off just massively overprovisioning your hardware and keeping the software stack simple.
Yes, Block Storage: https://us.ovhcloud.com/public-cloud/block-storage/
> Do they at least support the same API?
Yes
> Can OVH actually scale on demand?
Not as big as AWS, but yes.
Remember that you're getting 5x the compute resources for the same money. You don't need to autoscale as much. You're not fighting crappy EBS performance. You're not architecting around remote-network RDS databases with milliseconds of RTT. I firmly believe that for most applications you're going to be better off just massively overprovisioning your hardware and keeping the software stack simple.