Crypto service providers, just like banks and insurers for example, are required by law to register certain data from new customers. This includes personal data like the customer's name, date of birth, place of residence and place of business. They need this data to verify that the customer is not involved in money laundering or the financing of criminal activities, for example. The specific data that a service provider needs to conduct thorough checks depends on the verification methods it uses. You can check this with your service provider.