Banksy is remarkable and I don't mean art or even this, but the guy/gal/person has legit just stayed anon after decades in the public eye in an age where every clown with a phone cam is out trying to Sherlock their day away, genuinely just remarkable to manage.
Similar to dril, you can piece together who he likely is if you really try hard, but everyone has sort of agreed that we don't want to know because it's more fun that way.
My theory is that 'Banksy' is a cooperative effort between several artists. And at least one of them is fairly security-savvy, and able to cover their tracks.
I want you to say the sentence "I live in the 21st century and there has been a public figure doing public things for nearly 20 years who constantly makes news and we have literally no idea about anything at all about them" and think about what you just said