Sorry to piggyback. Can anyone talk about their experience with Signal payments using mobilecoin? I, too, like OP, am looking for privacy-oriented options for payment. I just noticed it was a thing, last night, as I was exploring my Signal settings. Might be helpful to others. Dunno anything about it because I haven't tried it. Thanks!

https://support.signal.org/hc/en-us/articles/360057625692-In-app-Payments#payments_which_ones

Edit: I searched for Signal and Mobilecoin on Newpipe and the results are less than favorible. 😬