Recently, I heard that China banned holding cryptocurrency and cryptocurrency transactions,
It is not banned in China, we can still use cryptocurrencies in China, as long as we have an internet connection and I think there is nothing to worry about even if they ban bitcoin, we can still use our mobile phones to use our cryptocurrencies without getting caught by the government.
so does that mean that having cryptocurrency in China would be a criminal offense?
It is not banned so there is no criminal offense.
Moreover, why create such a ban in the first place?
Again, there is no banned.