Is Ukraine English speaking? India is.
India really isn't. I mean, the majority of people might be able to converse in English, but anyone who has spoken to a few Indians in call centers (I don't mean to sound racist, but the fact is a lot of companies outsource call centers there precisely because there is a large population of English "speakers") knows that this doesn't translate to real fluency and certainly not to the ability to write at a college level (or what should be a college level).
Also, I think a lot of sites promise more than they actually perform, and there's no way for a customer to verify the claims you say are important. Customer feedback is faked all the time, work samples are stolen, and editors might not exist at all or might not be as qualified as claimed.
Again, I don't think being a native English speakers makes you a qualified writer, and I don't think learning English as a second/foreign language makes you unqualified. For customers without a real way to make a determination about a writer before receiving any work form that writer, though, claims of nativehood can be very persuasive and are often used as lies to attract customers to scam sites. It can also be used as effective and honest advertising for native writers.