Not to mention, borders on a ton of other countries with fairly porous borders, so you have the possibility of moving from one country to another.
I'm sure there's a lot more options that would crop up depending on a variety of factors. But if you're Snowden you want:
- A network of friends and associates you can trust to help support you, emotionally, physically, and fiscally
- To be in a country where the information you're in possession of might be valuable to that country, and could be used as a bargaining tool
- A country with good, but not great, relationships with the US (so no UK, Canada, EU is probably out).
- A country with a huge bureaucracy and judicial system - you want it to take years to extradite you
Hong Kong makes little sense on most of those, other than the judicial system.