Hi Alexandra, great that I could already two of your questions with this post.

So here we go:

1 - Tim Denning is a great example of repurping your content EVERYWHERE. He's super smart and has a lot of content to spread.

There are several other writers who first publish a story on Substack and then on Medium. Karen Cherry and Jan Flynn. So it's fine. However, my recommendation is also to offer original content.

2 - I once asked Medium about this. They can't give any advice on this. I asked a specialized layer (I'm in the EU, Germany). he said it would be okay to take your subs with you.

You can import them from any other platform as well (ConvertKit, Mailchimp, your blog...)

Talk soon!

P.S. This should be clear BUT I am not a lawyer and cannot give advice on media law. so you have to figure it out on your own