Oh, it was questioned all right, but The People's Republic of China does not care.
Criticise it openly and like all bullies, it retreats behind aggressive denial. It plans to be the world's number-one power, ahead of the USA, it has the drive, skill and patience to be so, and is on course to be so.
Its patience stems from its rigid, single-party, totalitarian system by which the President is that for life but still only in charge for the time being of a cohesive continuum. So it can plan decades ahead, without worrying about the next election. If held at all, elections only pick individuals in a single party. Unlike democracies with the government of the time worrying about an electorate able to choose between at least two very different parties every four or five years.
It is not always accurate to say it "steals" other countries' assets. Although China had no compunction about stealing Tibet and annexing various small islands (to extend its territorial waters) it usually works in one of two ways:
One is to buy assets on the open market, and assets can include major companies or industries, not just sports stadia. This is probably how China gained ownership of the Greek port of Piraeus, but I think meaning the operations, not the land and water.
The other is to offer to build, or to lend money for building, new assets. Here it practices usury, by setting at levels the debtor is very unlikely ever to repay in full, secured on the property.
In both cases, under its "Belt & Road" policy, it is buying influence as well as physical property. The territory and its inhabitants do not matter to China. The PRC does not want those, but wants either their valuable resources such as metal ores, or a political foothold in their victim's continent.
For example, China now owns almost all of the world's copper ores; not by invasion, but by buying the mines. The significance? Copper is vital for electrical and electronic equipment, becoming ever more vital to the whole world. It is also used for water-pipes in homes and businesses, and the loss of petroleum by political choice and/or depletion will likely bring an end to using polyethylene instead. Copper is also the main ingredient in the brasses and bronzes important in engineering, and in very small proportions it toughens the aluminium used so extensively from saucepans to aeroplanes.
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China is not alone in these activities, and in some ways it is acting like the 18C European colonists, though more subtly than simple military conquest and immigration.
Present equivalents include Saudi Arabia, a very repressive, fascist mixture of old-fashioned absolute-monarchy and religious bigotry. Partly in considering its future after its oil-industry, the Saudis are actively buying foreign sports organisations - including major British football clubs that also have stakes in major property developments in their own cities. As well as monetary investment, this is a political move sometimes called "green-washing". It is an attempt to buy silence. Like China and the Russian Federation, Saudi Arabia is terrified of being told the truth about itself, so buying influence helps reduce criticism from foreign nations they know allow free speech.
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Why is China on the Security Council? It exists for the rather grim purpose of reducing the risk of its members gong to war with each other...
China would not be afraid to send its "People's Republican Army" into land, sea and air battles, but physical warfare is very expensive in money and assets. (And lives, but lives are less important to the PRC, whose internal 20C death-toll exceeds those of the Nazi regime and the USSR together.) So it is taking over by stealth: out-competing on trade especially in mass-produced goods, buying everyone else's assets and companies, using the Internet as a weapon, etc.
