My concern with a company like Facebook entering this space is that it would be in their best interest to lobby against other cryptocurrencies with the argument

My concern with a company like Facebook entering this space is that it would be in their best interest to lobby against other cryptocurrencies with the argument that theirs is compliant, allows government surveillance, etc. If they can help convince lawmakers to make "unmanaged" currencies illegal they can lock up the space via regulatory capture and in the process become almost like a central bank. It's also an utterly insane privacy invasion to have Facebook getting into the banking business in any way whatsoever. Just call it PanopticonCoin?