Precisely the number of wallets of bitcoin as well as the scope and anonymity are definitely the things that make the government capitulate in regulation, except for bitcoin, there are also many other wallets used by users, instead of inventorying all these huge numbers, it would probably be easier to regulate users, KYC is really a process in this scheme. Although not most governments require but exchanges prepare these documents in advance, partly for confidentiality, the rest is a timely addition to accommodate regulatory requirements that the government may issue based on the pace of bitcoin development.