If you read the eligibility section of part 90, you will find that generally you need a commercial activity to obtain a license in business industrial service. See below:
§ 90.35 Industrial/Business Pool.
(a) Eligibility.
Persons primarily engaged in any of the following activities are eligible to hold authorizations in the Industrial/Business Pool to provide
commercial mobile radio service as defined in
part 20 of this chapter or to operate
stations for transmission of communications necessary to such activities of the licensee:
(1) The
operation of a commercial activity;
(2) The
operation of educational, philanthropic, or ecclesiastical institutions;
(3) Clergy activities; or
(4) The
operation of hospitals, clinics, or medical associations.
(5) Public Safety Pool eligibles are eligible for Industrial/Business Pool spectrum only to The extent that they are engaged in activities listed in paragraphs (a)(1) through (4) of this section. Industrial/Business Pool spectrum many not be utilized for the purposes set forth in
§ 90.20(a).
This took some digging, here is a license that shows no commercial activity: KDX311 - SMITH, HAROLD K but this individual may have listed an activity that was eligible when requesting coordination. A common one was veterinarians. A further check, shows this licensee is in business of land clearing.
By the way, establishing a business is fairly easy in most cases. A service business is best because retail or any sort of sales triggers state scrutiny as far as sales tax reporting.