Great article.
Besides, if you like to start writing, test your capabilities, gain traction, grow a portfolio and reach people from scratch, then Medium is a great place to get started.
Earnings can be an underlaying motivator, but this shouldn't be the main focus.
Some writers confuse with Medium being their employer, because they get paid by the platform. What's actually happening is you get returns on the network and environment you grow into. Medium just opens the gates for you, it provides you with a great access point to get started.
One thing to break that confusion:
If you are working somewhere else, you also don't pay your boss a monthly salary (like your membership on Medium) don't you?
Thanks for your writing!