Chinese tech companies have a vast internal market to grow within (similar to the U.S.), but contrary to the U.S, once they reach a certain size the government actively helps them rather than hinders them. Once they reach this scale they are selling in international markets, and it becomes apparent to Western countries that they should try to fight and at least regain their own domestic market power.
Huawei threatening to become the global standard 5G telecommunications equipment manufacturer is a good example.
China's formula of state capitalism is likely to win in winner-take-all markets. Tearing U.S. giants into pieces would only hurt our competitive position.