A. Private key (Seed phase)! An Achilles heel of the Cryptocurrency.
Scenario: A Cypto exchange platform has a hot wallet with 1,000 different coins. One day, this platform was attacked because of any possible reasons, and the private for the hot wallet above was stolen. Right at the moment when the exchanges staff and management team realized a potential fraud that some coins were transferring to a suspicious wallet, they could not stop these activities. This is because there are no such options like changing the wallet private key to stop the transfers or utilize 2-step authentication to avoid these stealing transfers. The best thing they could do to minimize their final lost was to quickly transfer all the remaining coins from that wallet to another one. The faster they acted, the more coins they could save. If they were too slow, the wallets balance would be a big zero. Good luck next time! You might have heard and read about many big Crypto exchange platforms experiencing hundred-million-dollar attacks recently. How do you think about this? Is this because those platforms do not have a good security system? I dont think so. Those big platforms should have many big brains to stop hackers from stealing millions of dollars that easily. Now its your turn. Think about this situation and you can find the answer from my sharing above.
The section above shares the title of your rather long post, let's take a quick look here: "Those big platforms should have many big brains to stop hackers from stealing millions of dollars that easily...." Your main point seems to ignore that most of the exchange hacks could be inside jobs designed to steal customer funds