Simple answer to your question is, VM do not allow it, their hub their firmware you have to abide by their rules. In no way do I agree with it, but you have to live with it.
This topic has been done to death already on the board, just do a search.
Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2