In some cases I am sure they pretend to have a poor understanding of the English language in the hope they can try to get away without facing any consequences for their actions however they have no such limitation on their language skills when they post using the alt-accounts.
Not impossible. But when I see people from my country, I understand that they do not understand well. Because good English speakers won't do such shit bounty. If they could write English, they would have started to write on the global boards where they would try to get some merits so they could join the campaign. Most of the bounty hunters are even unable to understand the bounty campaign rules. Which is one of the reasons they get disqualified. You don't have to understand English to learn how to cheat the bounty campaigns. They just create multiple accounts and try to get as many stakes as possible without thinking twice.