I think this is a service I'd use if it were available as an extension rather than a browser in its own right.
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(The implementations might differ in other important things, e.g. privacy or fee structure, but the basic user attention model seems similar enough to me)
Flattr 2.0 works more like Brave does; the user pays a monthly subscription, and Flattr just automatically distributes those funds to creators based on what sites the user views most often that month.