Well, it mostly already is.
The Chromium project is essentially everything Chrome already has, except Chrome contains a few proprietary components (IIRC the tracking is proprietary)
Most of Chrome's source code comes from Google's free and open-source software project Chromium, but Chrome is licensed as proprietary freeware.[15] WebKit was the original rendering engine, but Google eventually forked it to create the Blink engine;[18] all Chrome variants except iOS used Blink as of 2017.[
Open source =/= FOSS, yes it's licensed as proprietary, but you can compile Chromium from scratch and the only drawback is Google's backup server not letting you connect. Other than that, the browser is identical...