USADA would love to get their teeth into them, but they simply don't care because they make enough money in the USA not to worry about how the rest of the world thinks of them.
It's worth thinking about this very point more broadly. There's a lot of ifs here but...
If USADAs investigation should reveal corruption in the UCI, and this in turn leads to cycling being booted out of the Olympics then what happens to British cycling?
Pro-cycling could continue, with UCI in charge, just as the American NFL, NBA, NHL (and who ever else) do as a non-Olympic sport. Think though, the UCI also governs track cycling, bmx and also the paralympics cycling events. Without Olympic recognition and exposure, how will those events fare? Would Sky be interested in supporting British cycling? And what of national lottery funding?
Many ifs, but it illustrates the connections and what could be at stake. I don't see anything like the above happening btw, that's a real doom and gloom scenario. More realistic, imho, is an IOC approved cleansing of UCI (so still an old boys network

)