

It could be used to take my money, which directly and drastically harms me and benefits you. Or worse, “steal my identity” and take out a loan in my name. Things like bank statements could also potentially be used for that, and I have no reason to give them to internet strangers.
Yes, obviously I prefer to keep my secure credentials private to avoid having my bank account compromised.
I’m pretty sure any popular modern browser can be trusted not to leak that data, even Google Chrome. If anything I trust Chrome more because Google has an incentive to not obliterate trust in their security.
Now browsing history for advertisers is a different story - that is something I explicitly don’t care about. And that’s what I was obviously referring to in my first comment.