However, you must keep in mind that BAT is brave’s profit motive. Google only rejected the proposal because of money, you can’t expect brave to stay angelic in behavior forever.
Sadly, browser engines have become complicated enough, that an unfunded open source project is unsustainable after some time. In my opinion, Brave offers a new attempt to solve this (and other) problems with the modern web. I understand that not everybody likes this business model, but I think everybody has to decide on its own, which browser they want to use. After all, browser diversity is important.
If browser diversity is important to you I can't see how you would want to support Brave? No matter how good it is still Chrome you support. If we ended up without Firefox, how do you think Brave users would protest and try to force a bug in standard compliance of CSS to be fixed for example? The answer is they wouldn't as for them and everyone else using Chrome it would be invisible. Chrome is cancer like Internet Explorer, except it has now metastasized.
Supporting Brave is supporting a future monoculture of the web with fancy browser reskins and no matter how good Braves added features are it doesn't change the fundamental problem but becomes a part of it, working for instead of against the good of users.