Some people will just open a thread and try to make a mountain out of a small rock for nothing, @op of you hard cared enough to do a bit of research you will see they already made that announcement prior to the bch hard fork, between i don't think it is unusual for binance to be doing maintenance on a particular wallet while the rest are functioning, next time try to enquire before concluding.
You can really expect that there are really people who do really ask out immediately without tending or trying out to make some research first so that they would able to answer out into those particular questions in mind but
instead they do rely into the communities word about it yet sometimes asking the very basic things which you can actually obtain almost on your fingertips.
People cant really just spend a minute on googling and able to see on the reason on why theres disablement of withdrawal with BCH which is clearly had been in talks about the Fork
which is normal for an exchange to postponed transactions in times like these.
Links had been given out already for some clarification and theres no need to repeat and that would be redundant.