The site you refer to doesn't seem to even provide a Tonga service. I also notice they pretend to be a country in themselves when marketing their Casino license service. Regretfully this field also has a lot of "black hats" operating within it, not necessarily these guys, yet the indications are there. When shopping for services like that its always better to look at vendors that operate from a slightly better regulated jurisdiction, like for example Cyprus. Here is an example http://www.internetincorporate.com/ of company formation professionals that are trustworthy. Tread lightly in the murky tax haven shallows.