Improvements to Private Networks(digitalocean.com)
digitalocean.com
Improvements to Private Networks
https://www.digitalocean.com/community/tutorials/digitalocean-private-networking-faq
https://www.digitalocean.com/community/tutorials/digitalocean-private-networking-faq
Great news, definitely a step in the right direction. The fact that DO's "private network" isn't really private is something that's not very well known I think (try googling for the topic).
Until then: Use DO firewalls to whitelist only the services connections you want. Their firewalls treat private and public networks equally -> no more publicly accessible NoSQL databases :)