>they have to solve all those solved problems again because companies that solved the problems won't share their solutions.

...because those solutions are the company's competitive advantage that China has tried to steal for years on end now? Not to mention in many instances those 'solutions' are owned by or access controlled by the parent country of said company, many of which view China as at the least a bad faith actor, and at the worst an inevitable opponent?

Pretending China hasn't engaged in the world's largest industrial espionage campaign over the last two decades, and then victim blaming the companies involved for not "sharing their solutions" with China is a perverse form of logic.