Another RF neophyte here - what's the selling point or applications of an RF transceiver over the 300 - 928 Mhz band? It looks like those frequencies were used

Another RF neophyte here - what's the selling point or applications of an RF transceiver over the 300 - 928 Mhz band? It looks like those frequencies were used for TV broadcasting but the spectrum has been reallocated, and there's not a lot of unlicensed space to play with. Given this what kind of applications are there for this device?