1) I don't think it was a glitch, I think the activation server for this outdated, unsupported software was being sunsetted. 2) I don't know, but there's a huge difference between CS2 that can legally be used by anyone and CS2 that can legally be used only by people who paid for it.
1) I'm just calling it what they called it. 2) There is a big difference but it doesn't mean it's a smart decision. If they said "Here you go guys, we aren't supporting this anymore so feel free to use it however you want" Adobe would gain some respect by a portion of their target market. Instead, they posted download links and said "please don't download this!"