Why does Discord the company get to own the message history on public servers but Twitter or Reddit or traditional forums can get scrapped by anyone wanting to

Why does Discord the company get to own the message history on public servers but Twitter or Reddit or traditional forums can get scrapped by anyone wanting to make their own commercial AI willy-nilly? > These are social spaces where a lot of young people essentially grew up. An important part of social development is making mistakes and learning from them. How can you make mistakes when those mistakes are archived for all time for everyone to see? Understandable, but really, if you want to solve that, then you're up against all of social media. The only difference is that Discord wants you to make a free 2 minutes account so you can join the public server to look at what they said, instead of putting it on Google.