The world watches the US and with live broadcasts of US racing into the UK, it can generate its own liquidity. Few companies are going to bother negotiating with the US govt to let them in, ain't gonna happen any time soon and intellectual property for race fields etc aren't their concern.

HK racing would need locals betting on it to generate the liquidity as its not televised into many places - they tried it a few yrs back and the pools were small. I think they'd rather try goodwill and negotiate with them to get in legally rather than earn tiny amounts of revenue and ******** off the govt.