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If any site that takes KYC documents and sells the document to another party, then howcan to identify that if they do not disclose and/or if they do not mention about the data breach. As the data can be shared from various sites, we usually use various types of websites each day.
Many websites we visit and submit our personal information to are most times because we trust them, you can’t just give your personal details to a website you just come across without knowing of their virility with such informations. It may not be easy to know the site that may have sold your data out, but it is also much possible that it may be the most recent one you’ve uploaded your personal information to especially if you have some reservations about them at the time of even registering and providing this personal details. That is why you only give your personal info to where is trusted and have good reputation of trust from existing users.