It seems natural that certain people who are anti-government and/or very privacy-conscious would be driven toward Bitcoin. There are other coins that are more focused on anonymity, but none gained the reputation and trust of Bitcoin, and Bitcoin also gives an interesting mix of both respecting privacy and promoting transparency.
It's interesting and Bitcoin can give people a mean for privacy, transparency of transactions, decentralization of its network, and full control of their bitcoin. Depends on each person, with different demand on privacy, anonymity and knowledge, there will be different practical ways.
I'm not a fan of Assange, Snowden, and other similar people, primarily because their distrust for the US seems to match their sympathy toward Russia, an authoritarian regime waging wars against other nations and oppressing its population.
They turn their swords against their national governments but they fled towards another nation that is worse than their homelands, that sucks. If it is about human rights, it's truly to say that Russia is bad.
Their activities mean something for their homeland's citizens because it creates pressure on governments to change, minor or major, so their contributions have value, I have to recognize this. But if after all, they migrated to Russia and had to say sweet words about Russia just to satisfy that regime under Putin, it sucks again. Honestly I don't know Snowden has ever said sweet words about Russia or Putin.