It's not really much different than the rest of the world. Really I'd argue the US is the only country with a major manufacturer that is almost entirely pipe tobacco focused, C&D. Kopp in Germany could also qualify but they have less market presence worldwide than C&D does stateside. STG is the overlord but pipe tobacco for them is an afterthought, it's a drop in the bucket. They make more on accessory sales than they do on blends.
We're a very small market and while I mourn the loss of Sutliff because they were a great go-to for cheap bulks they weren't the only option. C&D in the US, the Gawiths and Germain's in the UK, Kopp and Dan Tobacco in Germany, hell even boutiques like Vincent Manill in Belgium keep our little market pretty well stocked with options.