As elahd hypothesized, this is the trade-sanctions thing -- if someone from Iran would win and there's some way I can legally pay out the bounty, I'll do it, but I don't want to be in the position of owing someone a bounty but having geopolitics prevent me from paying it.

The reference to "other problem countries" is simply because I can't keep track of which countries are on the list right now... I'm pretty sure Iraq, Syria, and Libya have all gone onto Canada's list at some point recently but some or all of them may be back off the list. Sorry if it seemed a bit pithy; given how often I see no-sanctioned-countries clauses online I figured that residents of said countries would know if they were likely to be affected.