That’s not exactly true. Cannabidiol (CBD) is naturally occurring and there’s a commercial FDA approved drug for epileptic seizures in children called Epidiole

That’s not exactly true. Cannabidiol (CBD) is naturally occurring and there’s a commercial FDA approved drug for epileptic seizures in children called Epidiolex. If I remember correctly, the patent is for “Oral cannabinoid formulations”. Even without a patent, companies can get FDA exclusivity but for not as long as a patent grants them so unless the addressable market is huge, it’s a financially riskier bet.