[gnicholas]

With Revue and Substack, do the authors have access to subscriber email addresses? If so, that would somewhat blunt concerns like this, both directly (if you are booted off the platform) and indirectly (presumably the platforms would be less aggressive in their rules/enforcement if it is easy for authors to leave).

[mshroyer]

https://astralcodexten.substack.com/p/logistics

> I'm saving the Substack mailing list regularly to my hard drive, and if I go somewhere else I'll let you all know.

So this is possible on Substack at least.

Some Substacks also use a custom domain name, which would make migration off the platform even easier.

[rexf]

Revue's homepage[0] says:

> You own your list, forever > Bring the audience you’ve built, and take it with you anytime. You are in control.

0 - https://www.getrevue.co/