Everyone uses smartphones. But to supplement the other good answers here, at some level of wealth, so much of your activities, interests and purchases are extended to secretaries, planners, asset managers, and otherwise individuals about whom you can claim “I’ve got a guy for that”, that tracking you as an individual becomes less effective.

Of course, nobody is immune just due to wealth and billionaires who use social media are tracked just like anyone else.

What types of videos do you like? I have so much high quality content available I literally cannot watch it all.

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The people concerned this much with privacy are certainly less than 2%. They’re already in a niche market for the purpose of privacy. Not that much of a leap to support Linux (which by the way is likely higher than 2% of their user base.)

Because it’s all built in. Proton password manager can create a new login for a site. In the same process it also generates a password, creates a new email with a domain that can’t be linked back to me, with no setup on my end. Technically I can set up bitwarden to do that but it’s a lot of configuration and it will end up using my domain for every email which, even if it can’t be linked back to me, all of my email addresses can be linked to each other by merit of using the same domain.

Until there is a major competitor to Proton that solves all of that, there is no alternative.

None of these incorporate email aliases automatically with a password manager