Its a fact that all small and weak nations are used by big powers, in one way or another. Call it friendship, call it brotherhood, call it sheer dominance or call it commonality of interests, its all the same. The bigger powers do all of it, in any way and every way, by hook or by crook, to eat the whole pie. The weaker nations know about the real deal but since they cant touch the pie themselves( because of obvious reasons) let alone eating it all, are therefore happy to eat the left over, which they are even able to digest. So in the end, even knowingly that they wont get the maximum out of it but whatsoever comes their way will at least not let them starve to death, makes them happy with it. Only those who are economically developed or somewhat developed are scrubbed to a lesser extent.
Saying to stay neutral is easy then doing it. Its practically the hardest thing to do out their ( Can a poor villager negate the orders of the landlord??) but if achieved, as their are some exceptions, can lead the country directly to the highway of prosperity.
Its a harsh reality but the only way known to the world because of its practicality. That is a why Bangladesh is no exception. The only best possible thing to do in such a situation is, to let the biggest take best bite and not the bigger, although sounds weird but its the only way to make the maximum out of it. The bigger can be compensated somewhere else, although it would make alot of noise and complains about it. If the case is reversed, the only looser will be the host party.
So its wise and make sense If Bangladesh lets China to peruse its peaceful interests in their country, which can also line in with its own.
Two more important things to note are, The intent of the approaching Country and the other is the capability and (more importantly) the competencies of those who want to compete.
BTW India is also in race with other powers of using Bangladesh .
Would like to know the difference between concern and Threat in this case.
Adios