Dude, are they legal?
Regarding getting TikTok info, It's a Chinese company, I don't think they are bound to give someone's info to US's gov official, that's a red flag for you.
SourceOn Friday, the U.S. Court of Appeals for the District of Columbia Circuit denied a motion filed by TikTok and Chinese parent company ByteDance to temporarily pause legislation that would ban the social media app in the United States if ByteDance does not sell it before Jan. 19, 2025.
Yes, gov email is obtained legally. In response to TikTok (and other social networks), you will be getting access to a portal where you can submit requests. It's up to the social networks if they want to honor the requests and of course, if there is court orders or actual legal documents to strengthen the case then they will most likely honor the request.
Even if you get those gov email you will still have to rely on social media to honor the request and court documents are required to strengthen the case but why would court give some citizen who’s bot gov official (even though they have gov email), you cannot even make that claim in court “That you have a gov email, therefore you have the right to those documents”.
Even if you ask for info from SM using that gov mail, there will be a lot of factors to consider, it’s good in hands of someone who knows how to social engineer.