It's not even about sides. There is no left wing party in the USA - the Democrats are a right wing party. The problem with the GOP is not that they are right wing, it's that they are extremists. A lot of their "policies" are not policies, they are crimes against humanity. 'People who are demographic X shouldn't have the basic human right of Y" is not an opinion, a policy or justifiable in any way.

And boycotting people as Eich is first and foremost an act of self-preservation.

1. Eich is, evidently, a hateful cunt who invests into destroying the human rights of random people. By exposing your e-mail, bank accounts, your communications and your identity to him (by using his browser), you are inviting him to violate your rights as well.
2. By using Brave's shit, you giwe Eich money. Thot same money he later uses to fund the atrocities he and his peers commit. Thus, by using Brave's shit, you are not only complacent in these crimes, but actively participating.
3. Less relevant, but still, by using a Chromium-based browser, you help inflate Google's oppressive market share in the browser space, letting them push shit like Mv3 or WEI. If Brave actually cared about making a private and secure browser and fighting Google's monopoly, they'd base off Gecko or, better yet, build their own engine.