It highlights the flexibility and control mechanisms available to governmental bodies in regulating BTC transactions. Specifically, it points out that the government can exercise control by whitelisting an address that is not restricted by a covenant. This implies that despite the decentralized nature of cryptocurrencies like BTC, there are still avenues through which regulatory authorities can exert influence or control over transactions by selecting which addresses are permitted to engage in transactions. The mention of adding this capability to the features suggests an ongoing development or enhancement of the policies or technologies governing BTC transactions to accommodate regulatory needs.