Certainly there are unitarian Christians. But all of the unitarian Christians I have ever had substantive personal interactions with appear to be unitarian in response to a fundamental misunderstanding of the trinitarian doctrine of God. And right in the beginning of that article you linked, it says Jesus is “not equal to God himself,” as one of the defining characteristics of Christian unitarianism. But even trinitarian doctrine is not about saying that Jesus is “equal to God himself”—that is, trinitarian doctrine is not that “Jesus is God,” but that “the Trinity is God.”

Folks are certainly free to believe whatever they wish, but unitarianism in Christianity as a response to trinitarianism has always struck me as a response to a poor understanding of trinitarianism, rather than as a response to trinitarianism itself. The unity of Godhead remains key to trinitarianism. Katherine Sondregger, in her Systematic Theology: Volume 1, The Doctrine of God, for example, begins by focusing at great length on the unity of God—but she remains trinitarian.