> Apple doesnt allow all sorts of apps on the appstore, but that is never said as "Apple is erasing illegal streaming"

Because they are not "erasing" anything, they are refusing to provide a platform that enables the direct (app whose intended purpose is) delivery of illegal content to you.

The difference being one will not facilitate the activity, while the other, is actively suppressing it. And thats what is meant by erased.

Your question in other comment If I ask Siri to give me a link to illegal streaming site and if it refuses, then that would be the better comparison. Then we could say "other seedy corners of the internet that have been neatly erased by [Siri]"