The 5G you think of is not operating in certain frequencies that FCC wants to open for sale - in fact I found only one mention of nationwide "up to 4GHz" freque

The 5G you think of is not operating in certain frequencies that FCC wants to open for sale - in fact I found only one mention of nationwide "up to 4GHz" frequency use for 5G, in Japan, with one operator and AFAIK in limited use. UK has some location-limited licenses granted for internal networks.