The service I used offers diagnosis for a one-time fee, and does not dabble with prescriptions at all. The diagnosis came from a practicing psychiatrist that is licensed in my state. Those factors, plus the doctor’s recommendation are what made me comfortable enough to go with it, but I normally don’t love going with online options for stuff like this. I just was tired of the runaround.

The diagnosis - which did not include treatment recommendations - was transmitted to my GP from the psych. And my GP worked with me on treatment options.
I assume if the website got shut down, it would be inconsequential to my diagnosis unless the psychiatrist was found to have fraudulently issued diagnosis’. (Which is always a possibility.)

But that is a very good cautionary tale. Done didn’t just say they would diagnose ADHD in 30 minutes or less, but they utilized a subscription model and issued Adderall on an auto-renewing basis.
That whole thing seems pretty sketchy to me. It appears they were trying to tie your health care to their subscription model. They can go kick rocks.