About hackers / scammers getting caught, in crypto, this seems like it rarely happens.
Scammers / Hackers, most of times get a "get out of jail" card, which is wrong, but that is how it is, in the crypto wild west.
It will evolve tho, and I am sure things will eventually become harder to all of them.

Someone mentionned "signature", but I will just use a stronger "forbidden word".
Bounties.

Yea it's a good advice.
Let's not forget about tether pair, which is traded pretty much anywhere too. ( 1 tether = 1 USD).

It is always recommended to store your bitcoin inside a wallet, on which you own the private key.
The reality is, anything else than that means you have to rely on a third party that could get hacked, or simply get you in troubles, should a fork happen, and so a chance to lose your coins.
This is the difference between centralization and decentralization.

Martial law in marawi sure but in the whole province of Mindanao? Hell no.