Many HAM's have GMRS too,
Thats the sad part you need two radios to be GMRS legal,
Though many China radios gladly work on HAM 70 cm and GMRS,
Most of them don't put out enough power to be illegal.
My Anytone, says 25w, but in reality on UHF its about 10w.
Same for the other TYT, Bajoie, Leixen, 15W at the most.
QYT makes one thats 75W, UHF, and B-Tech sells it as a
GMRS legal radio, I'm sure they detuned it.
Mean while the QYT 890Plus says 50w UHF.
Where imo if a person is licensed for both, you obviously
will be versed in how to setup your radio to be in spec
for GMRS....
That said I often wondered WTF would the FCC chase down
a lowly Jeeper etc using GMRS at 10w or so, when there is the
stations on the CB that you know are bushing 1000w or more.
Literally talk ground plane for hundreds of miles. They would
be easy to chase down.
One thing I will say if you interfere with HAM 2m/70cm they live
to get out a directional yagi and go looking for you....