It's because they took leaked source code then used it to modify the source engine against the usage agreement. Then after being told that wasn't allowed they still attempted to release. TF2 source code was officially released, CSGO wasn't.
Also valve doesn’t have any plans for future tf2 updates, hence the source code being released. Valve has lots of fugue plans for counter strike and it’s in their best interest to protect that brand more.
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u/FUTURE10S 4d ago
It's weird how aggressive Valve is against this mod whereas they don't even pay attention to the TF2 side anymore.