http://lainyubrp2aabmxhepbttfdbl53dct2inqifs42buvpf6w44uiitbeqd.onion/blog/matrix.html
Users media is not a big problem, as it can be cleaned just using find to delete files that have not been used for, lets say, a month. But content moderation can be a real headache. Your server could spread cheese pizza across the federation and you wouldn't even know it :). That's the reason I have my registration closed.