Do you believe that Facebook is capable of adding a similar filter to match "to change hands"? If they were capable, what could the explanation be for why they don't?
Given that Bangladesh is pretty poor and small, the likelihood is that if they were to pour resources into it, eventually the business would pull out of the country, as it wouldn't be profitable.
Note that if they block to change hands, then people will start using another idiom, so a mere filter isn't going to accomplish much here.
Bangladesh has a population of 160m, and almost all speak Bengali, which is also used in India by a significant minority. It's not like we're talking about ignoring Liechtenstein. It won't eat up the profits by having someone add 10 rules to a filter list for a target audience of 200m+, even if they are poor.
I should probably stop doing that.