Nope, FCC regulations.
I don't recall seeing anywhere it says that FRS / GMRS can't be used for business use, so long as a license is obtained by each operator. We use 2 ways all the time when loading / unloading and setting up the
stage... To keep in contact with everyone.
This is a direct quote from the FCC on FRS:
"FRS allows two-way voice communications over very short distances, generally less than one-half mile. It is generally used by families or small groups to communicate while on group outings when group members are fairly close together,
but can also be used in business-related settings."
Walmart uses
channel 1 for management communication, which I believe is FRS.