From their Facebook page, it appears Dynu has been the victim of hackers or ransomware. Not too much information from Dynu other than their services are down.
Interesting my VPS instance is still running thankfully; but I have no email or DDNS service.
https://i.redd.it/d97rfpg5ttwh1.jpeg
Source: r/Dynu · by /u/Delicious-Director43