Could they? Sure.
Do they have anything on me?
* One BTC transfer
* IPs where I'm connecting from (if they are lying and storing them)
* My traffic (if they are lying and storing it)
* My unencrypted traffic (if they are lying and storing it)
Do they have ... on me? * Email? - nope
* Phone number? - nope
* Credit card? - nope
* My first name, family name? - nope
* My address? - nope
* My mother's maiden name? - nope
Because I never provided it to them because they never asked for them.