User blog comment:Rexory/Why I quit Twitter?/@comment-27070860-20191106155631

Twitter is one of the places where they allow that kind of material if it’s considered artistic, medical, health, or educational content- you should’ve acknowledged that when registering. Usually the content is marked as ‘sensitive’ and shouldn’t show up in your feed if you have the ‘hide sensitive content’ box ticked in your settings. But, since not everybody marks their tweets as sensitive you could still stumble upon them.