It makes me happy to hear this from you (and I appreciate that you expressed it in a much more succinct and less snarky way than I did ;).
Perhaps you’d consider adding this advice/request to Medium’s help documentation or even onboarding?
Or something like: “Great writing speaks for itself. There’s a reason why no fine novels end with ‘please tell your friends to buy this book!’. With that in mind, please think twice before asking people to recommend or share your posts. Thanks!”