> What proof do I give them and how does it tie back to my email?

Presumably your ID so that feds may pay you a visit when they feel like it, your email need not apply.

I’m surprised that there’s even enough pushback against ID verification to matter, all the corpos are probably salivating at the idea of having fully accurate profiles of everyone, think of the ad and product targeting. The govt. would also love that, for different reasons.