Not OP but can I just comment that there are some high-quality answers here, good discussion. Thanks!

Comment saved, thanks.

Don’t have anything to contribute, but saving this post for its very useful content!

There are already cryptocurrency features in the Signal app of dubious utility.

Yeah, that was a bizarre move, but it doesn’t interfere or interoperate with any of its comms functions. Also I have never even read online about anyone using this crypto feature, let alone known any one who did.

If they love you they will download an app for you. And it’s important to keep in mind that most modern mobile OSes will stop showing notifications from an app or even hide the app if the users doesn’t open it after X amount of time.

So it’s up to you to keep the conversation alive enough they get used to using it. If my 83 year old father can, so can your friends.

Signed. Enough with this kind of bullshit in the EU.