You can ask yourself why privacy is beneficial at all?

And it's because revealing breaches of social etiquette might lead to conflicts and unrest between serfs. Which lower their economic efficiency in their service to landlords.

Online is not unique in any way. It even should have more privacy because people reveal too much voluntarily already leading to all kinds of unrest.

How many people's economic activity was disrupted because they couldn't keep their cheering of Charlie Kirk's demise in private for example?