Shrooms are highly unlikely to be sought after by people living on the streets. They are orders of magnitude easier to manufacture than more common street drugs, yet are rare to find people in possession of. They are often not fun, especially if you are at a point where you are already suffering, not to mention how quickly the brain develops a tolerance (often after a single dose). They are nearly impossible to abuse.

People on the streets are after opioids, meth, and alcohol, all of which have presently-legal analogs already.