Googling around a little bit it actually seems like they have a lot of their largest customers in their US. Apparently Whole Foods, Walmart a bunch of other retailers and several American government institutions like Fema and several city administrations.

Wouldn't surprise me if the US is actually their largest market.

You hardly hear about them, doesn't mean they don't exist.

SUSE is a large distribution based in Germany, in Europe they have significant inroads in government contracts.

They're a German-based company and, yes, they've always been bigger in Europe than in the US (relative to the market as a whole).

SUSE bought Rancher in 2020, and that was also in the news.

They once had one of the best KDE desktops available.

Last time I checked, a number of Cray supercomputers were using it in some capacity.