Yes they dropped support for it which was a real blow, but luckily existing machines weren't stopped and we still have several Arch machines running. On Wed, Sep 26, 2018 at 4:13 PM Eduardo Machado via arch-general wrote:

Hi folks,

Firstly, i am not a digitalocean affiliated, but i use their services. A long time ago, Arch Linux was one the supported OSes, latter they dropped this support. Now, although it is not officially supported again they just launched the ability to upload Custom Images into DigitalOcean. You can now import the OS of your choice directly into DigitalOcean and start a Droplet. [1]

[1] https://blog.digitalocean.com/custom-images/ --- Eduardo M. Machado