I disagree with your first sentence in its sweeping overgeneralization. The second sentence seems somewhat true but there's a reason why eBay failed in China: they ported their English website over without consideration for the idiosyncrasies if the chinese market and netizen.

These two sentence are also not intrinsically linked. Just because there has been protectionism does not mean that the China apps are automatically worse. In fact, a bunch of features of weibo and we chat have found their way to Twitter and WhatsApp. (One example are voice messages which were a core part of wechat from the start. They were important to get people in rural areas or older people to use the app, due to the difficulties of typing Mandarin, especially dialects.)