The entire point of this post is asking what happens to KYC when the business goes bust and there is no employees and if they delete accounts do they delete KYC information. Alot of exchanges going bust and I'm curious
Businesses are often required to keep documents a certain amount of years even after going out of operation, though to what extend will vary from country to country.
Regardless of that, even if a defunct company deletes your KYC data, it doesn't necessarily mean that it is gone. It could still be stored in a government database somewhere or other third parties -- sometimes KYC gets outsourced to other companies so these might still have copies. And of course there's always the possibility of a data breach.