You do not need any license to buy or use Milo.
Just like Wi-Fi, Milo only uses unlicensed radio spectra so anyone can use Milos. This separates using Milos from many other handheld radios – that includes the many common radios on FRS and GMRS channels. Yes, those need FCC licenses to use.
Milo complies with FCC and ETSI radio frequency (RF) regulations.