Where as China being authoritarian any civil unrest has a much higher likelihood of overthrowing the government in a violent and expensive way. Transitions of power happen infrequently and are very dangerous particularly at the highest level given how synchronized authoritarian governments tend to require.

Everything in life has trade offs. And while the Chinese have accomplished things the US hasn’t; imperfections in government are inevitable and the US is arguably more resilient to these imperfections over extended periods of time given the US ability to effectively and efficiently accommodate changes to address these imperfections.

For example being part of WTO and being a capitalistic state which mass produce goods and services for the whole World

If you dig into the collapse of most countries/empires/super powers, they collapse from either:

- External pressures - foreign influence through military/conquering, investment, or mass immigration. With the exception of Taiwan, China has been effective in reducing or at least controlling all of those. And even that may be cracking where you see groups like WHO refusing to even say the word "Taiwan." With the US and Russia tied up with other things, military is less likely an issue to.

- Internal pressures - social strife due to mass deprivation (starvation, poverty in general) or mass immigration/tribalism. Once again, China has been effective here. They've raised the standard of living and disappeared most of the major dissenters. They've even reduced tribalism by isolating and disappearing huge minorities. Good? Absolutely not. Effective? Unfortunately.

Even the "One Child" policy seems to have led to less strife than predicted. While there are some places that have 140 men for every 100 women, those are the official numbers. It appears that under the policy, huge swathes of people just didn't report daughters being born. There's a generation of women who simply don't exist.

Based on the investment strategy (both nationally and corporately), China has gone all in on Africa for years. If I had to place a bet, they may effectively run/own Africa in a decade or two. If not in person, on paper.

How do they work/travel/pay without ID?

So I guess, in the same way people in US and UK do.

Also remember that illegal work is not uncommon in every western country as well

If you're paid cash, you pay in cash

If you live and work in a small rural village in continental China, where girls have been hidden and everybody knows it, who's coming to check if you have an id or not?