Most Linux distributions are maintained by volunteers. Linux distros are largely free operating systems created and maintained by volunteer enthusiasts who know a lot about Linux coding. Often, as with Antergos, the developers run out of time to maintain it and the distribution gets continued.
Over the course of history of Linux distributions, many well known distros have fallen by the wayside, only to be over taken by yet another Linux version.
I used to run Antergos for awhile, but now I’m pretty much settled on Arch Linux. The last few times I tried to install Antergos I ran into install errors, so I could tell the project was running into problems.
Good luck to the developers and community at large! We’ll be sorry to see you go!