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our loved "just" from #Antergos forum has published a series of post where he

"demonstrates one of possible ways to remove all packages, installed from [antergos] repo, and the repo itself, from an existing Antergos installation. It is transformed in [antergos]-free system, or Antefree ☺ for short. The final system uses native #Arch repos and packages only."

for the main DEs, here #kde

https://forum.antergos.com/topic/11877/antefree-plasma

Of course you can wait #Antergos publish its final update with similar result