It's good that you do that. My experience has been hit or miss. Sometimes I get the form response, along the lines of (paraphrasing): we're looking into it and will take action if we think we need to. On another occasion, I had to ask Medium to block someone for me, since I wasn't allowed to block him myself; he'd already left some vitriol and then blocked me — so that I couldn't respond but so that he could continue reading and commenting his garbage on my work. Medium responded that they blocked him for me. At other times in years past, I also saw very abusive accounts get suspended or deleted. So it's definitely something Medium can do well...