They mention heightened scrutiny around controlled substances (with amphetamines for ADHD as an example) on the FAQ. https://help.headway.co/hc/en-us/articles/29673299878676-Doc...
The risk is that a drug dealer or addict pays people to use their identities and possibly insurance info, pretends to be them and to have ADHD in telehealth sessions, and stockpiles Adderall.
I agree, if you’re just doing talk therapy it seems overkill. But they may have concerns about emergencies, where a patient is in crisis and you realize you don’t actually know who they are.
And insurance fraud: Alice has health insurance, her friend Betty does not but needs therapy, so she signs up under Alice’s name (“oh, I actually go by Betty.”)
In general, I don’t think it’s that outlandish that the company wants to know definitively who its patients are and be able to demonstrate it does, but hopefully they can come up with more options for verification.