The issue is not the fact that Google owns the web. It is that the web itself has become decimated to the point where a company like Mozilla does not have a future. Facebook, Uber, TikTok, Snapchat, Instagram, Whatsapp, etc. None of them are optimized for Google index. Most top consumer internet applications don't take place in your browser.
And I'd argue that google's about the only thing propping up the internet. Chromium's a reasonably open platform (certainly more so than internet explorer, which not that long ago looked destined to become the dominant platform), gmail has kept email viable, android is somewhat open (and without it, apple might own that space entirely), etc
Every other player that's gotten traction has set up a walled garden