Then one day you woke up and found out you received 10000 Bitcoin
from a wallet coming from one hacker's wallet who just hacked one big exchange..
~
This might very fictional but the possibility is there.
sticking with fictional version, here's what I would do
I would return it to the exchange and hopefully get a reward for doing so
What I'm trying to emphasize is to avoid KYC and using only one address.
is there really still people using only one address ever?
creating bitcoin address is so easy, if you just have only one address
then you haven't been practicing pseudonym transactions in cryptocurrency