As people tend to re-use shell commands, editing them as they go, I can totally see someone doing like curl XX | less and then curl XX | sh or something. If the download is relatively speedy.
You could argue this is one of the reasons less doesn't interpret control codes by default. As it would let applications hide stuff like that to redraw the screen.
Why would anyone do this? If I see some unknown, interesting file, I might run cat, head, tail, less or vim on it. If it's binary then maybe I'll use xxd. But it wouldn't even occur for me to pipe it to a shell.