Is it? Steam does it all the time. Afaik they only completely remove games (meaning you they get removed from your account), when they break some TOS stuff.
As for Blizzard themselves (since this article is about Warcraft 1&2), they still offer downloads for old titles. I can just download Warcraft 3 or Diablo 2 right now, even though they’re remastered, and the old versions not for sale anymore.
Yes, that’s what I meant. I didn’t mean you could still buy them. Sorry, I probably should have clarified that in my first comment.