3) micropayments

There are many issues with those, like the wildly different standards of living across the globe. OTOH anyone can acquire Monero if they want to. But someone from a rich country will likely be able to pay for more fake accounts/visits than someone from a poor country. With the ad market the difference between where the visitor is from is very important. Some ad clicks may cost a dollar if they're coming from a rich country and 0.01 cents if they're coming from a poor country.

I'm not suggesting cryptocurrency micropayments for accessing the web but it's on par with PoW in that it only requires money, not privacy.

Perhaps the way forward is for people to wake up and stop visiting sites that infringe on their privacy.