The question here is if that government is willing to encourage such leak against secret agencies of a government. If a government granted Snowden such asylum, what kind of signal it sends to its own employees?

I am a supporter of Snowden, but I doubt there is a "free" government that will take the same side as Snowden against the U.S. government. Snowden might have a better chance with a government that deem U.S. government as an enemy such as Cuba. But there might be a dilemma that the U.S. government can portrait him as one that took the enemy's side.