I can answer that

Yes it's Wagerworks (who are IGT owned) who impose the restriction so that IGT remain on the right side of the law in every jurisdiction.
However, I spoke to them a couple of weeks ago for an update and they said they are reviewing the policy on a regular basis because they would prefer to be able to accept other countries (obvious really) but that a decision will depend entirely on legalities and regulation in each territory.
They suggested it WILL happen eventually, but very unlikely to be this year unless regulatory changes are made in each dependent country.
FWIW, the Alderney licensing authority (where most of the casinos are licenced) do not impose country restrictions on licencees.
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