I think it easily falls under the same umbrella.

Financial privacy, especially from the state, is the ultimate form of privacy.

There's a reason we have had bank secrecy [0] a long time before anything like the modern Internet-based privacy movements, with their much more expanded definitions, came along. Heck, some countries based a whole lot of their appeal on the strength of said bank secrecy laws, like Switzerland.

[0] https://en.wikipedia.org/wiki/Bank_secrecy

Unfortunately bank secrecy is quite over even in Switzerland. They constantly get pressured by the EU to share data regarding EU citizens' accounts. The hunt for taxes is ongoing, under the pretense of preventing money laundering. Yet something in excess of 200bn euros was laundered through the Estonian branch of Danske Bank.

why? Why is what you do with your money different than what you do with your speech?