@buttondown reckon you could put in redirect option for a newsletter archive so that the /p/ from the former Substrack URL redirects to the /archive/ Buttondown URLs? That way I can safely delete my Substack account and content.
Mastodon is the best way to keep up with what's happening.
Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.