I think this might be a you problem because both Medium and Substack allowed randoms on the Internet to post from day 1. There aren't any requirements, anyone can do it.
Im gonna chip in and say that yes while they allow randos to post to the same extent i imagine the average person views a blog post/article as more legitimate when it has the branding of substack or medium attached to it rather than someones unbranded personal website
Im gonna chip in and say that yes while they allow randos to post to the same extent i imagine the average person views a blog post/article as more legitimate when it has the branding of substack or medium attached to it rather than someones unbranded personal website