But if there are too few non-mining full nodes then it would be easier for the miners to "Sybilize" their way to change the rules, is it not?
Sybil attacks can not change the program code on my node therefore they can not change the rules of the network.IE: They can't change hard coded things like block size or block speed or anything that my node program code will reject.
I reply to this one first.
Ok. But what if the Bitcoin network has
very few mining or non-mining nodes. Would it not be an open opportunity for some group to do a UAHF Sybil set up to force the decentralized part of the network to hard fork to the rules the group wants?
Is it possible that that kind of set up, controlled by Jihan Wu, is in place in Bitcoin Cash's network?