At the moment DO has a lot populair services where ipv6 is not available like:
Even digitalocean.com is not reachable via ipv6. I think this is painfull for a company that want to be innovative but does not yet support the new internet protocol that is already live for more than 10 years. (that is long before digitalocean was founded)
Ipv4 is running out. Pools are already empty. So I think that it is a good idea to give ipv6 the same priority as ipv4. So every service that is avaiable over ipv4, should also be avaiable over ipv6.