It seems transparently slimy how Equifax tries to discourage opting-out.
Beyond the difficulty of opt-out, you have to send them more info (including your SSN, a copy of a government ID, and a proof of address that they offer can include your W-2 or paystub).
If only Equifax were even 1% as diligent about avoiding data breaches as they are at making sure no one can maliciously opt you out of them sharing this data that no one wants shared.
https://theworknumber.com/employee-data-freeze/