Thanks for sharing your knowledge on both this thread and your blog, Mike. Allow me to continue taking a critical/negative approach (Although this approach wouldn't imagine Facebook replacing MySpace).
I disagree that Google Ads offering pay-to-view ads in Chrome is too far out there. Google might not innovate it, but could easily copy it if the idea gained traction elsewhere. Although Brave's competitive advantage of 'Don't be Evil' could well see them wrest 5-10% of market share.
Who would use pay-to-view ads? People who are time-rich (have time to view) but money-poor (sufficiently motivated by money reward). That is, most people. The USA is currently liquidating their middle class and their buying power. So is high volume of low value sales a requirement - idk, I don't understand the advertising industry. Or maybe BAT is up to you, EU. China will be covered by a home-grown clone.
Presumably, pay-to-view remuneration will be proportional to the viewer's buying power or local wage. But what if I employ Average Zhou gold farmer from Guizhou, China, to remotely access my laptop to browse ads for me? A technical challenge for Brave. What if I employ/enslave Scripty McRobot to browse bot through ads? Code captchas at every turn presumably, eating the time and patience of human viewers. You must have already considered this, so I'm keen to hear your thoughts.