There are no "requirements" to be a surveyor.
There are no requirements to CALL yourself a surveyor. NAMS/SAMS maintain fairly high standards (a.k.a. "requirements") for surveyors that they accredit.
Anyone who does not seek out an accredited surveyor pretty much gets what they deserve. And anyone who gets a completely worthless survey from an accredited surveyor needs to be talking to the accrediting agency--they take their standards quite seriously.