Hey, great question! Right now we operate in all countries and let the user decide if they are allowed to play where they live. In the near future we will be adding GEO-IP blocking/enforcement but we aren't there just yet.
Instead of setting a gray area and leaving the decision-making to your users, I think you should place a clear list of countries now, either a list of countries allowed to use your platform or not.
There might be a few malicious users that would happily take advantage of this unclear policy, then later on threaten to ruin your platform's reputation or ask for refunds if they lose their bets.
If I remember correctly, a similar instance already happened here in this forum wherein some user played at a casino where it is prohibited to gamble if you are from a country where gambling is deemed illegal. He then argued that his playing session was done in another country, which then also turned out to have similar policies (gambling is illegal there, too). So, you see, leaving the decision to your users isn't a good idea. To protect your business, better to have a clear policy and a clear list.
