I am sorry to read about these constraints. They also happened to me in the earlier days when I started intense engagement with the contributors of our writers. I couldn't clap and leave messages but gratefully Medium removed them after contacting the support team. Now I can publish more and show my engagement to stories contributed to my publications with no limit. Thank you for writing this valuable piece highlighting the importance of meaningful engagement on this wonderful platform. As Aiden mentioned sometimes fake accounts abuse the platform therefore Medium takes measures to prevent such attacks.