Alibaba got 95% of their revenue and profits from China, because they have a hard time expanding overseas. Luckily alibaba owns Lazada in south east Asia. Tencent is better since they have a big gaming footprint worldwide. But wechat is still mostly used in China.
Tencent is a threat to facebook, if tencent manages to promote wechat against whatsapp. Tencent is certainly dominating over microsoft and Sony, since tencent is able to expand its footprint worldwide by acquiring game publishers. Now if tencent's ecosystem is weakened in China, where else do they find the resource to expand overseas?
Many Chinese startups are taking seed money from Tencent or Alibaba. Are you expecting investments from monopolies like China Mobile or PetroChina for these innovative startups?
Apple, Amazon, and Microsoft are not slacking at all. They making more money over Alibaba, Tencent and Huawei. Apple, Amazon, and Microsoft are investing in even more startups worldwide.