I believe main issue is transmit wattage. As of a 5 or so years ago FRS is supposed to be 2w max on certain channels shared with GMRS and these things are typically 5w out of the box. You can change transmit wattage on most if you care to follow the rules on FRS. GMRS ‘requires’ a license more pay to play. HAM freqs ‘require’ a license that you get by passing a written exam.
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