> if everyone who feels nervous because of Google's shithousery jumps ship to fastmail it doesn't really solve the problem of overreliance on a single provider.

> if everyone who feels nervous because of Google's shithousery jumps ship to fastmail it doesn't really solve the problem of overreliance on a single provider. In these discussions it's not really about the volume of people using a single provider, but about individual users relying on a single provider to perform multiple functions. So the issue of over-reliance on a single provider is usually in the context of that provider being in a situation to take offence at something unrelated and apply penalties that impact other things you actually rely on. For example Google don't like something you do related to YouTube or AdSense and they kill your account. Now you've got no email and your domain expires as you can't pay for it. In these kinds of cases it exactly solves the problem as the vital stuff is not affected by shenanigans with the everyday stuff because you've spread the functions across multiple providers.