And Mullvad is not in business if selling user profiles to advertisers, at least as far as we know

Because the data used in browser fingerprinting is also used to render pages. Example: a site needs to know the size of browser window to properly fit all design elements.

I think this should be baked into client apps.

The popular email analogy works here too. When you are setting up a new phone, you get a default email client app that offers you to log in or sign up to the default email service. And usually user can choose to log in with their service if choice, for which they have to sign up in advance outside the client app.

Having a default Fediverse client on new phones is not happening anytime soon, but if someone’s mother installs a client app from the store link sent to them by a family member, she can get similar default onboarding experience.

Default instance can be picked by geo location, or maybe the less used out of 3 most popular instances. Or even maybe an instance ran by the client app developers.

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