In general, I have no problem with sites existing like that, however, Codidact is not the right platform for it.
First off, it might be sensible to read this answer to a similar question on SE: https://medicalsciences.meta.stackexchange.com/questions/747/how-long-can-this-site-be-popular-if-everybody-is-asked-to-see-a-doctor/748#748.
There are already dozens of (national) sites specialised for this kind of thing, e.g. for providing a professional second opinion or even giving a preliminary diagnosis before seeing a doctor in person.
The problems with giving medical advice over the internet and especially in a relationship where doctor and patient have never met before are:
- Anyone could pretend to be a doctor: Forging reviews, qualifications or certifications is possible, even nowadays. An advantage with a real situation is that you see how many patients there are and how a doctor treats you physically and emotionally. (While it is easy to know about the theory behind taking blood, you can usually easily discern who is qualified and who is not by seeing if someone is actually capable of doing it.)
- Patients sometimes don't like to collaborate and intentionally don't provide all necessary information. Detecting such a case in a real situation is already a big challenge, on the internet it is basically impossible or just a matter of pure luck.
- It is highly complicated to nearly impossible to run laboratory and technical-assisted diagnostics remotely and for cases where multiple possible diseases are identified, this is an absolute requirement.
- Sometimes, there are situations where a doctor needs to have haptic feedback, like in actually touching someone, to provide a sensible diagnostic. This ranges from broken bones to ruptured tendons to bodily abnormalities.
- How is virtual medical advice handled legally around the world? Questions related to liability vary strongly around the globe.
All of these problems can be solved to a certain degree but Codidact is not the right platform to solve them. A lot of technical and legal investment is required to provide a platform where you can receive sound medical information reliably. And that doesn't even touch the problems of motivating medical professionals to answer questions in their free time or amassing enough (specialised) doctors so that they can cross-check their answers.