Hi,
this method is definitely interesting and apparently it is adopted by many, and personally, I really believe it works!
Therefore, to reach 100 followers may be a good method, but to really earn money by writing on Medium I believe that the basic requirement is to write valuable content that people appreciate and are therefore strongly interested in reading.
I for one have been a digital entrepreneur since 2004 and I share for free here on Medium the skills and tools I use to be able to make a living working exclusively online.
Therefore, if you are also interested in this, come visit me and most importantly ... follow me!