I personally think every person should make their own substack. (I may create one, or may use another platform.) There must be a way to recommend other substack content, with a link.
Yes there are multiple ways to follow and share links, just like on other platforms. I am not sure I see a major difference between Substack and platforms that have come before it like Minds, or Medium, or many others. Maybe its unique strength is that it is set up for people to make money through selling subscriptions if they wish, which seems to be a "thing" nowadays. But substack seems to have a "buzz" around it, and everything I have seen so far indicates it has lots of features beyond that of past blogging platforms, so it's off to a fast start.