Easy one, the code itself is racist bc it was developed by white supremacists who never checked their own racism. The algorithm is just a big dataset that they programmed with certain tagging, but the internet itself is bad and the people who are working on this are usually highly paid white people, so you're working off a racist/abelist etc dataset and tagging system. So tiktok tags "ugly" people as something they don't want to go viral in case of "bulying" but that of course, includes visable disabled people. And the twitter issue where it still favors cropping to anything but a black person. Youtube has also made it so queer issues are silenced, videos even with the word "lesbian" get demonitized even if it's from a lesbian identified person talking about their positive experiences and there's no sexual mentions.

These also leads to insularity --> twitter can see people who talk in a certain way only follow other people who talk like that. That means white people literally won't even see black people recommended to them and so on.