* If one uses his own data for KYC, bad actors may sell it for various uses, some good, some very bad (one worse case can be even getting loans from bank in your name)
Well, I'm thinking hard how that loan part with someone else's KYC can be possible, with documents that aren't credit card. I mean, if one submits government documents and another tenders them to get a loan, there should be a picture there on the document of course. At least, I know passports and national IDs have them. Isn't it? Even cashing out money at a bank doesn't come that easy let alone getting a loan. The screening is always stringent. To me, except a bank is unscrupulous and involved in the racket there's no way someone else can get a loan with another person's documents at a bank. Again, won't the bank match the loan seeker's signature with the signature used in opening the account with them that it has on its computer? If there are properties as collateral, in whose name are they registered?
Kyc is not mandatory so far you do not use the exchanges that are demanding for kyc, so implying it is mandatory in this regard is not absolutely correct, but only mandatory on the exchanges that are enforcing it, but not still necessary to use such exchanges.
In order not to sound remote (while recognizing that this thread isn't about KYC being compulsory or not), let me quickly ask you – would you rather trade at an average exchange not requiring KYC or a more trusted one requiring KYC?