You don't consider chromium open source?
EDIT: this is untrue, chromium builds are available for all platforms from chromium.org. Please ignore
I'm not sure exactly what you mean by that. chromium.org doesn't offer chroimium builds on their website but there are a number of places you can get someone elses build, for example https://chromium.woolyss.com/ or https://github.com/macchrome/winchrome/tree/master or presumably just build it yourself if you wanted to.
But yes, that is fair.
choco install chromium
choco install ungoogled-chromium
(Disclosure: I work at Google on Chrome.)