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Yes I've heard placebo's work better if they have an official license
That may even be true, but even it is isn't, licensing placebos would be a handy bypass to the reluctance of some GPs to prescribe off-label. Prescribing antibiotics for viral infections is dangerous on a population level, we need a way for doctors to get rid of idiot patients quickly in a way which doesn't threaten the rest of us.
I thought that there were officially licensed placebos available for GPs to prescribe without having to waste money on charlatans peddling hippy nonsense, but apparently this is not the case, so GPs often end up giving placebos via prescriptions for active drugs having no effect on the condition being treated, or they resort to homoeopathic preparations, thus enriching fraudsters.