Bought MOBILECOIN? You might have been SCAMMED - 37.5 MILLION coins were PRIVATELY sold at 80 CENT per coin That post has 525 upvotes.
Signal says F~~~ you to the user has 174 upvotes.
An upvoted comment from another post says : "He forgot to add: we did not want you to know we were adding MoxieCoin to the server code using your donations to pay for it. Probably a slight missrecollection. That can happen."
Other posts are discussing the company behind the cryptocurrency, telling Signal to stick to messaging, regretting having talked family and friends into using Signal and asking for alternatives, check the subreddit out for yourself.
I think it's yeah. Matrix is the protocol and there are a lot of different clients with Element being the most mature. Try it out before getting your parents to use it.