Actually, since GoToWebinar is a global product, you'd think there might be a good solution for global participation and the form would accomodate ALL countries internationally. The frustrating thing about this is this registration forms have not be updated in all of the time since the product was launched. I know because I was a customer that long ago.
Part of this has to do with GoTo being an American company, and thus are not allowed to do business with certain countries. I hope that is not why they are not allowed to have an "Other" choice.
If GoTo makes an official comment here, due to political pressure, it will be a well thought out "we'll look into it."
It is unfortunate when politics gets in the way of us creating a better, more-informed planet.