Here is some info from wiki on CopperheadOS.

Disagreements between the two founders over business policy became increasingly heated over the first few months of 2018, and led to Donaldson firing Micay in June of that year.[17][18] Micay responded by posting his dismissal notice on Reddit, and by deleting the cryptographic keys necessary to release updates for the project.[17][19] Micay said that he considered "the company and infrastructure to be compromised", and that he would "prevent [Donaldson] from harming any users".[20] Copperhead failed to provide CopperheadOS updates for several months afterwards.[18] Micay continued the development of the open source parts of CopperheadOS as the Android Hardening project, which was later rebranded as GrapheneOS.[21] According to Donaldson, as of February 2019 he and Micay were in a legal dispute over the incident.[22]

I wouldnt use software from this unethical dev even if he is not working on the project anymore. who knows what he can still do.