USSR did not practice imperialism in the Marxist/Leninist sense - ie. they did not export capital by keeping countries from industrializing, nor did they have a financial oligarchy like imperial core countries.

China does not enforce harsh austerity policies that the US does via neocolonial institutions like the IMF or World Bank, and loans for the infrastructure they build in partner countries which are necessary for industrialization are often straight up forgiven for long-term cooperation.

Even modern capitalist Russia does not have the global monopolies and complete control over the global financial system that the US does by its dollar hegemony.

the US has had/still has unfair/unequal trade relationships

This is... putting it very lightly. The US government literally coups, invades and destroys countries to keep them from industrializing and developing on their own.

It has waged countless wars across the Middle East and Asia (Iraq, Vietnam, etc), coup'ing Africa's and Latin America's governments (Chile, Congo, etc), keeping them unstable and unable to unite and stand on their own so they have no choice but to rely on those exploitative institutions, and brutally sanctioning and embargo'ing those that do manage to escape their grasp (Cuba, DPRK, Iran etc)

This isn't an issue of the US government being more "evil" or just worse than others, it's a systemic problem of capitalism and Europe and later Japan's brutal colonization of the rest of the world for the last few hundred years which, contrary to what these governments want people to think, has not stopped but merely changed its form to neocolonialism.