I get that, which is exactly why you don't want any one browser having just under 70% marketshare like Chrome. If there are multiple options for people to switch between, then they can switch to another one if their current browser does something they don't agree with.

If there isn't another option, you're stuck. We open ourselves up to horrific effects of browser monopolies like all the security issues that Microsoft didn't give a damn about back when internet explorer had a monopoly. It takes effort to switch to a different browser stack, like moving away from Chromium for example, but in the long term you do not want everyone stuck with only one option, because that will be even more costly.