1. Secure?
  2. Future uses
  3. Pros and cons
  4. If you don’t use, what’s the most trusted lightning wallet you do use?
Sparkwallet seems like the most feature packed ln wallet out there. But it's custodial to the max and relatively new so be careful :p
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I saw everything but a wallet. Safety? I don't know, since you don't own what you deposit.
Another negative thing I saw is that you need a phone number and email to register. I saw more of a business than a wallet itself, although the "wallet exists".
I think they are more cons than pros.
And if you are looking for wallets I personally use and like Muun. Anyway investigate, I leave you a link to a list of Lightning wallets
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