
Tax Filing Websites Have Been Sending Users’ Financial Information to Facebook – The Markup
The Markup found services including TaxAct, TaxSlayer, and H&R Block sending sensitive data

The data, sent through widely used code called the Meta Pixel, includes not only information like names and email addresses but often even more detailed information, including data on users’ income, filing status, refund amounts, and dependents’ college scholarship amounts.
The information sent to Facebook can be used by the company to power its advertising algorithms and is gathered regardless of whether the person using the tax filing service has an account on Facebook or other platforms operated by its owner, Meta.
There's a lawsuit ready to happen.