Vivaldi's business model is primarily revenue from deals with search providers. they don't exclusively get money from Google, they get money from all their search partners, including Google.

Brave is into crypto scams and advertising scams, so I guess you're right there. Their revenue is also tiny.

The rest aren't what I'd call "real" browsers, most don't have the same level of functionality and compatibility as Chrome, Firefox, Safari, Edge... Servo for example is literally just the rendering engine Firefox gave up on.