All the arguments about Chrome being insecure due to its proprietary software built upon it, are true, but why not use Ungoogled Chromium? (or another chromium

All the arguments about Chrome being insecure due to its proprietary software built upon it, are true, but why not use Ungoogled Chromium? (or another chromium fork that implements those features themselves). Mozilla is in a very bad position, their main source of income as I understand it is Google, because they're the ones that pay the most to have Google as a default search engine in Firefox. That and Googles anti-competitive practices, like when they implemented the Polymer redesign on YouTube, which had Firefox and Edge loading the site way slower than Chrome. I don't know what Mozilla can do even if they do all the right things, because Google will just keep throwing money punches.