Quote
if you change a node to have different rules. only nodes that agree with YOUR rules will accept them
Of course, so, I can create my Bitcoin cash in my own network. And If I can sell it in a fake exchange, to people that think my Bitcoins are real, they will have fake Bitcoins. There are not going to be useful, but there will be lots of fake Bitcoins. It is a possibility of fraud.
Im speculating, but I cant understand how can we trust in Bitcoin if this possibility exists. I mean, there is not a way to validate a real Bitcoin before we buy it?