Thanks for doing a good deed. I had not run across any of those posts, but that is horrible that they were there and of course, worse yet that you received a death threat for calling Medium’s attention to it.
I’m a bit stunned that anyone would complain about you being ‘a tattletale’. I mean even if the substances weren’t so harmful, someone using their Medium account to run their business, instead of for writing, is neither allowed, nor should we look the other way when we run across it.
Hope that enough time has passed that you are feeling slightly less threatened. Are you?
Take care. May good karma wash over you and allow you to focus on the fun part of creating!