> If we want top-grade products to remain available without a direct monetary transaction (i.e "free"),

Is Facebook a "higher-grade" social networking product than other free ones that exist without the same monetization of personal data, or than other free ones that could exist without the same monetization of personal data if such monetization of personal data was considered unacceptable? I don't doubt that Facebook delivers more value to shareholders than if they were not able to monetize personal data to the same extent, but I see no reason to believe that they or their competitors would be less of a "top-grade product."