China has a long and proud tradition as being at the forefront of civilization, and they see the last 100+ years or so just as a temporary setback. The current ruling class may not see the need to share with the outside world. This may sadly result in the decline of China's competitiveness on the world stage, but those in the ruling class may be more concerned with consolidating their power within the country. This is not a new problem for the Chinese; it's just repeating the cycle of every dynasty that came before.

On a separate note, Whatsapp has been copying WeChat's features rather than the other way around for years. So perhaps China thinks they can innovate enough on their own to match or outpace the outside world. While I don't think that's impossible, I don't think they've taken into account how much the cultural revolution wiped out a lot of culture and collective wisdom built up over the centuries, and that will put them at much more of a disadvantage than they realize.