The US Senate banking committee wrote a letter to facebook questioning about the nature and legality of it's cryptocurrency project code named Libra.
https://www.banking.senate.gov/imo/media/doc/5.9.19%20Facebook%20Letter.pdfThey essentially asked whether it would enable users to have privacy and would make it harder for the government to monitor every personal and financial moves of people in the US and around the world.
I believe the government is more concerned about control and monitoring of citizens monetary affairs. I hope Facebook coin will not limit their Influence and also lute them to the positives of the crypto industry and why it should be adopted by the government too