Many VPN to American servers because it's less competitive. Especially with the latest entry of battlefield being significantly less problematic to the Chinese government than 4 was I'd assume it's much more popular. There's not really a lot of reasons to VPN while gaming at all. The higher rates of cheating in Asia supports the idea that the scene is much more competitive, so you'd go to north American servers to cheat or to play in more casual games. I mean Korea was home to many of the best StarCraft players, they took gaming very seriously at least at one point in time. The only place I can see having any political reason to VPN , that still has the ability to buy BF and such, would be China due to the rumors of state mandated screen times and I have confirmed with a friend who moved to China, that that is BS, it doesn't happen and at worst was an experiment directed at children in high population cities for a short period of time that didn't really change anything because parents already limited their children's screen time on the whole as a cultural value. So yes, when I see a player with a mandarin name and 210 ping I wonder whether they're cheating or simply using American servers because the games aren't as high level on average. Sure maybe they're like my friend, and live in China but have North American friends but you'd expect to hear them chatting with their friend and they always seem to be alone. I'm not saying that every single Chinese player you see in a given server is cheating but I'm saying it raises questions. Not because of nationality but because of logic. Playing in servers where you have an obvious disadvantage simply doesn't make sense unless there's some other advantage like more casual games or you're giving yourself the advantage by cheating.
If you're playing in American servers you'll likely run into primarily, American cheaters, but saying they're all white trailer trash is completely out of touch, other regions cheat more and cheat engines aren't typically free if you're gonna get through an anticheat worth any salt.