It's big list and all those are having good volumes and very popular. That's nice! I think by the time platform is ready, there will be some more.
It is a nice strategy to begin with those; I think many look for low fees and for those that make large transactions low fees make a huge difference. Add to that the compliance part. With larger sums you need to have a compliant exchange at least so you wouldn't have to worry about the receiving bank complaining in respective countries.