Sorry, but 1 & 2 are trivial and relatively cheap to deal with.
Legal issues can be a problem for certain services, but I see many services for which that is of absolutely no concern. Do you see any major legal issue for let's say, Quora or Stackoverflow?
Google only got into trouble after they became big enough to have a physical presence in various countries, plus they have taken up the ill-advised strategy of flipping the bird to non-US authorities.
1 can add significant time and complexity to your code trying to figure out what date format, for example, should be shown to various countries or regions. The easy solution would be to show one and provide options, but then which one do you show? Do you do geoip? Then what language are you going to put it in? Do you outsource translation, or hire a translator? How do you moderate user content on a multilingual site? Do you show local prices, and if so, how often is the conversion updated (if at all)?
There are serious logistical problems to tackle, not even counting getting it all running and bug-free for every use case in every language with ever data format possible. It's a huge setback, especially if you stand to gain nothing significant from being worldwide.
Legal issues can be a problem for certain services, but I see many services for which that is of absolutely no concern. Do you see any major legal issue for let's say, Quora or Stackoverflow?
Google only got into trouble after they became big enough to have a physical presence in various countries, plus they have taken up the ill-advised strategy of flipping the bird to non-US authorities.