Interesting proposal from an interesting person, but let's be honest — the chances of this happening is next to zero. Even if Elon wanted it, it would be a regulatory nightmare for him.
I agree.
In comparison to Elon, Snowden being in charge of Twitter would be a nightmare for many people in positions of power and holding security clearances in the USA government. For example, the are many people there who believe Social media owned by political adversaries is a threat to the national security (Tiktok is an usual case or this discussion).
If Snowden took over, the Republican establishment would go crazy about it and the democrat establishment would question whether the Kremlin would try to influence the society in America through Twitter.
On the other hand, There is a chance Musk considers his offer for the sole purpose of causing displeasure among his critics.