If he had asked me, I would have advised him to avoid speculation. But if you can’t avoid it: Diversify.
I feel bad for the guy but crypto is patently a scam. Some sincere honest person always ends up losing everything and that’s how it’s supposed to work.
It wouldn’t matter...the issue is they used 2factor authentication to logon as him once they got his phone # all text validation messages were sent to his phone.
There are better ways to do 2factor authentication. SMS/Text is the worst way.
DON’T DO ANY FINANCIAL STUFF ON YOUR PHONE!!!! SIM swaps aren’t the only way they can hack you. Ignoring this principle is just stupid.
For that matter, don’t do any financial stuff using ANY form of online communication, except credit card transactions which are revokable. Don’t use Paypal. either.