I told her it's not activated by default but she doesn't want to touch crypto with a 10 ft pole. She says if it's in there then tax authorities might eventually come asking if the feature becomes popular. And then she would have to keep evidence of not actually using it.

I think her concerns are overblown, but it shows how incompatible taxable transactions are with a privacy focused app. The two things should be kept well apart.

[Edit] Politically, it kind of defeats the purpose as well. You want to be able to argue that you have a right to privacy when it comes to personal communication. You don't want to be in a position of having to defend the privacy of trading securities.