I like the recommendations but I would also just ban cryptocurrency wallets from the app stores (and traditional finance apps capable of transferring funds electronically). There’s not much you can do to stop scams in that space but if the devs distribute their own apps, at least the user can verify they’re at the original developer’s site or repo or whatever and possibly hold them accountable.
That probably won’t help on the scams — people in the crypto world get scammed more than aging grandparents, it seems. But I don’t want Canonical or Flathub to be held liable due to a lack of moderation resources. If they can ever automate moderation to the degree it’s safe, bring back the finance app category with some safeguards.