It's just the default behavior when clicking the reply button. The reason why people don't top post on Discord or any other messaging software is because it doesn't do it by default.
It wasn't always. I was raised to reply at the bottom, in Eudora. Then Outlook changed everybody to replying at the top in order to be obnoxiously modern or something, in the late 90s I think.
The reason why people don’t top post on Discord is the same reason our terminal apps scroll older lines upward. That’s the convention for active scrolling text.
E-mail readers have people switching from document to document and starting anew with each. When viewing documents we start at the top, and the reply is the most prescient thing to see.
