They're going to get that anyway for hosting people. And if you read their writing on the subject they do want to improve discovery as well as giving direct support to specific writers: https://blog.substack.com/p/substacks-view-of-content-modera...

"At the same time, while we take a hands-off approach with who may use the platform, we will continue to take an active approach in helping and promoting promising writers. We are doing this by improving discovery on the platform and building programs, such as fellowships, grants, and mentorship, to support writers. Our partnerships team will also continue to work with high-revenue and high-potential writers."

So I'm not sure this claim about avoiding recommendations is actually true.