Yep. I was running Arch Linux on a personal droplet, and they decided to deprecate support for it. I don't even think there was an official announcement about it. There's even quite a bit of backing to bring it back [1], and oddly, they use an old video on their front page with when Arch was still listed [2].
"Built for developers" => can't use developer's favorite OS. :(
Because Arch is what % of the userbase and how much does it cost to support that userbase? It gets kind of old hearing people whine about this. If you really want Arch there are providers that support it.