Earlier quoted context omitted.
Curious as to how many people manage to sign up for email addresses across a variety of providers despite all that decentralised server nonsense.
Are you kidding? The vast majority just use Gmail now, or perhaps an institutional account they were enrolled in “automatically” and have a strong motive to check regularly for school/work purposes.
If you present people with a list of 30 email providers they've never heard of before, it's going to throw them for a loop.