Probably for the same reasons much of the world has the same interest. The U.S. has an outsized impact on the rest of the world economically, militarily and culturally.
It follows that such interest intensifies when a completely unqualified, f'ing moron slimes his way into the WH and deploys his full array of incompetencies, not limited to bad judgement and astounding levels of ignorance and stupidity, manifested in a climactic and criminally negligent response to a pandemic.