NAIROBI, Kenya — For nearly a decade, as China made a historic push for business opportunities and expanded influence in Africa, most of the continent’s leaders were so thrilled at having a deep-pocketed partner willing to make big investments and start huge new projects that they rarely paused to consider whether they were getting a sound deal.

China has peppered the continent with newly built stadiums, airports, hospitals, highways and dams, but as Africans are beginning to fully recognize, these projects have also left many countries saddled with heavy debts and other problems, from environmental conflict to labor strife. As a consequence, China’s relationship with the continent is entering a new and much more skeptical phase.

The doubts aren’t coming from any soured feelings from African leaders themselves, most of whom still welcome (and profit from) China’s embrace. The new skepticism has even less to do with the hectoring of Western governments, the traditional source of Africa’s foreign aid and investment (and interference). In a 2012 speech in Senegal, Hillary Rodham Clinton, then secretary of state, implicitly warned Africa about China. The continent needs “a model of sustainable partnership that adds value, rather than extracts it,” she said, adding that unlike other countries, “America will stand up for democracy and universal human rights even when it might be easier to look the other way and keep the resources flowing.”

Some Africans found Mrs. Clinton’s remarks patronizing. What’s most remarkable, however, is how passé this now seems, given skepticism about China from Africa’s own increasingly vibrant civil society, which is demanding to know what China’s billions of dollars in infrastructure building, mineral extraction and land acquisition mean for the daily lives and political rights of ordinary Africans.