I wonder if the different treatment is due to Bitcoin coming of age in the Obama era instead of the GWB era like those other examples? Forgive my naive question as I'm not into crypto, but is it even technically possible for them to shut down Bitcoin if they wanted to? I lived through the P2P file sharing era in the 2000s where ISPs were forced to block access to various things at the behest of the RIAA/MPAA, so it seems like they could just go after the P2P blockchain in similar ways if they cared. No consensus; no Bitcoin, yeah?
If that were the case then I also wouldn't trust Tor to provide any privacy from the US government considering NRL created it. My assumption is that reality is probably somewhere in the middle, where the existence of Bitcoin doesn't harm the government's interests too much while also convincing the occasional egotistical giraffe that it would be safe to stick their neck out.