Substack says 3M+ customers subscribe to paid newsletters on its platform, up from 2M in February 2023, and credits its recommendations feature for the growth (Sara Fischer/Axios)

Sara Fischer / Axios:

Substack says 3M+ customers subscribe to paid newsletters on its platform, up from 2M in February 2023, and credits its recommendations feature for the growth  —  – The company said it plans to expand the recommendations feature, which helps writers promote other newsletters in its network …