This dilemma might exist if Ecosia was thoroughly censored and corrupted to the point it was completely unfit for purpose, but it isn't, so for now it seems more like a hypothetical concern than a real one.

What is a real concern, however, is the American government influencing world events in ways that materially harms people outside of America. That government retains its power through the ongoing global economic dominance of American companies. Ordinary people can't do much to directly affect global affairs, but they can at least choose where to spend their money, so why wouldn't they choose to spend their money with companies who aren't propping up foreign governments that harm them?

Materially harms people inside of America too.