Businesses, privacy, and bank accounts. How easily could someone find me

If I'm making money with a business, could someone find this out? How would they find this out.

I have purchased an anonymous LLC

An EIN would tie me to the business during tax season?

Curious about the privacy regarding these things and how easy it would be to find me.

How does an EIN tie into this and tax season/IRS

accounts anonymous bank business businesses easy find making money privacy tax tax season things