I reside in another country where Party Poker is now unavailable. On the Party Poker site they simply state they no longer offer service. Frustratingly, several other poker sites do offer service, even though technically under the law it is a grey area.
I cannot speak for Serbia but can for my home domicile, but might pose a similar situation could exist.
In the first place you have local politics in play which want to present a 'moral' face to the world. Therefore casino's are officially banned whilst the entire country knows a huge underground network of illegal gambling activity takes place- including
casinos.
As regards
online poker sites themselves, I presume some are 'diplomatic' in business and find a way to maintain a discreet presense (anyone with such real world experience will know what I imply). I presume other companies that do not provide service fall into one of two categories. Perhaps they were unsophisticated, tried to enter the market, had little idea of business in such an environment, ticked off the local authorities and were banned. Or, when they were faced with certain demands and took the moral high ground and decided to withdraw.
As I said, no idea of the local politics in Serbia, but did find it interesting that
Vuk011 above noted there was a tightening/restriction of this type of business, with a couple of players potentially left when the dust settled
'paying taxes'.
