What finance jobs? The only companies in software engineering paying more than FAANG are trading companies like Jane Street. And AFAIK they have harder interview loops than Google.
Yes, trading companies and even trading divisions at banks.
I've interviewed at plenty of them (only one in recent years, though) and while I wouldn't say they were easy, they aren't doing completely irrelevant challenges like leetcode.
I've certainly never studied for one, unless you count flipping through a book or two just to remind myself of things I may not have thought about in a while. Like 1-3 hours tops.