WebMD is for the general public (GP) and useless on anything you need in depth - helpful for broad inquiry. UpToDate which practitioners use is amazing but too much information for the general public.
It's part of what I mentioned in another comment which is that the internet is to general and vague in its information (and generally low-mid quality) while private information is, sometimes, of higher quality. It leads people who want to learn more about things in a bind where they are limited by the accessibility to good quality information.
Also you don't want the GP to have access to uptodate because they would self diagnose in so many of the wrong ways and wouldn't understand everything.
GP is quite a confusing initialism to use here as GP often means "general practitioner", which is like a family doctor/primary care physician in much of the anglosphere outside of the US.
They have patient/caregiver subscriptions. I'm not sure if it's the same set of articles that doctors get access to. The ones I use are definitely not written for the layperson, though they do have a whole series of articles written for laypersons "The Basics" and "More Than The Basics" which are designed to be handed out by doctors.
Those prices are for the patient subscription. $20 for temporary access doesn’t seem too bad for medical information if you need it, but most people aren’t going to pay it without trying it out first. Particularly when free info is available.
It's part of what I mentioned in another comment which is that the internet is to general and vague in its information (and generally low-mid quality) while private information is, sometimes, of higher quality. It leads people who want to learn more about things in a bind where they are limited by the accessibility to good quality information.
Also you don't want the GP to have access to uptodate because they would self diagnose in so many of the wrong ways and wouldn't understand everything.