There is a git source, including an 'arch' branch from the actual creator. Yes, I assume any pkgbuild that would be accepted into the repos would be predicated on that source.
(I dont get why you take this so personally .. but I also dont get why you dont understand this ... the actual project is here: https://github.com/Eloston/ungoogled-chromium
which also includes text like " NOTE:
ungoogled-chromium-bin is not officially part of ungoogled-chromium. Please submit all issues to the maintainer of the PKGBUILD.")
..how do I make this more clear?
... I am OK with 'ublock:Origin' being in the repos, but I am not OK with the malware 'ublock' being in the repos. I am ok, again, with our packages being sourced from 'ublock:Origin' ... but I am not OK with sourcing that software from a random fork.
Does that make more sense now ?