Yes, they learnt this from the US, who subsidized Uber for _14 years_, Amazon for 9 years and Youtube for many years until they had destroyed global competition and made everyone dependent on them. This is now happening again with Anthropic and OpenAI, of course.
While saying this did you not consider that subsidized Chinese companies would claim the exact same, with at least the same amount of legitimacy? The whole idea of monopolization is that it becomes impossible for competition to arise.
You also forgot to mention Uber which has had numerous competitors, both on the taxi front as well as food delivery.
> AliBaba has been around almost as long as Amazon.
No idea why it matters how long a company has existed. There are hundreds of thousands of companies that have been around for 2-3 decades.
China's subsidies are comparatively much shorter.