I think most browser end up using Chrome source code. So even if you say use other browser like firefox or vivaldi you end up using chrome also because backbone still chrome

And I hope they never will, Chromium needs a competitor to keep it in check to prevent Google from doing things that are not with the users benefits in mind (such as previously they tried to introduce some browser integrity thing)
(Sure there is Apple Safari with WebKit but barely anyone uses it willingly)

Internet Explorer/MS Edge dropped Trident/EdgeHTML and moved to Chromium
Opera dropped Presto and moved to Chromium

Firefox with Gecko is the last major browser that isnt Chromium

Chrome, Edge, Brave, Opera, Vivaldi, its all chromium underneath