Why was MURS really formed? Because every store imaginable (including home depot, radio shack, and the like) were selling the Blue Dot/Green Dot business radios and just slipping the FCC license application form in the box. They were relatively cheap, sold like hotcakes, and of course nobody actually paid for a license (which like was $199 or something back then). Blue/Green Dot literally became a free-for-all kinda like the FRS of today. The FCC didn't know what the hell to do with that mess, so they just made it license by rule, in true FCC fashion.
I still have probably 2 dozen Green/Blue/Red Dot 2 channel 1 or 2 Watt radios. Forget who made them.