Linko90: It's a Blizzard thing.
If you're ignoring how protective Blizzard are with their IPs i don't know what you want me to say lol
blotunga: Wow, finally someone blue speaks about these things. Kudos. And also unfortunately it's unofficial confirmation that no Blizzard games will come here in the foreseeable future.
I mean it's not an official GOG statement, so don't take it as one. But let's be clear, Blizzard (much like Nintendo) are fiercely protective of their IPs which they still sell on their client. I feel like this hopefully answer the OP :P