I would have agreed a while back but now i don't.

I think its gatekeping and there should be a way to get everything without another adult telling you no.

There is a lot of bias around what and how and when and who can take what.

Advertising prescription medication is indeed illegal in the UK. https://www.gov.uk/guidance/advertise-your-medicines

OTC is ok.

It's just you. There's nothing wrong with informing adults about the existence and benefits of medications. Many consumers aren't even aware that there are medications available to treat their conditions. They don't know to ask their doctor about it. Even a lot of doctors don't stay current on new medications. There's a real knowledge gap.