That Substack allows spammers to stay and subscribe everyone to their spam blogs for them at will isn't news to me. My work's blacklist is full of them, all addressed to mail aliases that can't send mail.
That Substack is a Nazi bar, more literally than most social websites, both is news to me and explains so much else about it.
Ars Technica, "Substack's 'Nazi Problem' won't go away after push notification apology": https://arstechnica.com/tech-policy/2025/07/substacks-nazi-problem-wont-go-away-after-push-notification-apology/