I have a newsletter for CTOs, and I try hard not to link to Substack any more, the number of my readers seem to automatically lock the article behind a pay wall

I have a newsletter for CTOs, and I try hard not to link to Substack any more, the number of my readers seem to automatically lock the article behind a pay wall - Substack is lost I think as a website (don't know about the newsletter aspect). I have some disdain to link to Medium but it's not as bad.