Something with ~0% market share outside of China and which trades the US having root for China having root is not a viable alternative.

In theory you could have something produced by a country other countries might be willing to trust, but the number of countries that are both trustworthy and large enough to sustain a globally-viable platform is practically the empty set at this point.

Which means the thing it calls for is something open source, since that both allows contributions from multiple countries and solves the trust issue by leaving no single entity in control of it.