I made an paid account with medium to see posts related to my work, and I really enjoy it. I get an email every day with a handful of articles based on what I said my interests are/followed authors and I can read them with none of the issues other people are talking about (obviously because I’ve already caved to their business model, just pointing out the annoyances do actually stop, unlike some premium services).

If you think your readers will follow you to a paid platform, I don’t see anything wrong with it. But if they don’t want to pay, it sounds like it will be a bad experience. I would be skeptical of having a broader reach, also, since there is a lot of competition, not all of it human.