I have a friend who likes taking screenshot so much that he would take a screenshot of even payment transactions from banking apps and large or small bet winnings. I don't know if he loved to brag with it, but he won lots of arguments with real traders and sellers who accept transfers and claim to have not received it.
Why leaving screenshots of your transaction history on your phone? How will you even feel secure doing that, it doesn’t make any sense to me. What if you end up giving your phone to the wrong person, and they saw the receipt that you screenshot on your money phone, don’t you think your life might end up being at risk? The person already knows you are financially okay, so he might end up sending people to attack you and you will be robbed of everything which you are having.
I am concerned now however about his screenshot taking habit, because it would be more problems for him if his phone falls into wrong hands and they see screenshots of Bitcoin transactions mostly.
Definitely he’s going to be in a big problem if the phone falls in a wrong hands, but all what you can do is to advise him, if he listens to you, then it will be better for him, but if he doesn’t, then their is nothing you can do about it, you can’t stop him from making screenshots and keeping them on his phone.
* My question is, how safe is it to keep screenshots of Bitcoin/crypto transactions and useful information, on ones device?
No it makes no sense. Any information which you think it’s private, once it’s stored online, then it’s no longer private, anybody can have access to it, and it might be the wrong person that will have access to it.
* How do I go about letting my friend know about such a habit of taking and keeping screenshots on his device that I have observed and warn him about it, without looking like I sense bad days coming?
It’s easy, walk to him, and talk to him about the behavior, or are you scared of your friend? If you are not scared, then just talk to him. I think that’s just the only thing which you can do.