Also- are there defenses against physical seizure/confiscation under duress of e.g. the bit-coins used for Ethereum, built into the protocol? If not, how can it be free from government interference? Unless you're paying entirely for digital goods which can be delivered anonymously, wouldn't you still have to interact with the physical world at some point? Is the idea just that it makes it harder for the government to stop money laundering and so they'll hopefully give up?
I mean, look at your examples, Uber and AirBNB. They moved fast and made lots of money for themselves... And, what, changed the world? Eh, not really. As they matured, governments caught up with them, and now they're collaborating more and more. Uber and AirBNB aren't subversive anymore- they've done their disruption, had their fun, made their money, and now they're just another app. And looking at the bitcoin space, I see similar movements- miners are big conglomerates now, major exchanges roll out more and more invasive KYC protocols, the IRS releases guidelines describing how to declare these on your taxes...
You think AML enforcement won't be coming? "Hey, where'd you get that Ferarri?" "Uhh, well, somebody must have just accidentally sent the money to my Monero address, and it's untraceable so I can't send it back, so..."- you're not going to have a great time fighting that! Sorry if you can't handle the facts- but if you actually want to fight a government (whether or not that's a good thing for society) you should really think about what you're dealing with! In terms of enforcement, even a perfect privacy coin doesn't seem much harder for a government to handle than cash or precious metals.
The big exceptions are those working in areas where their local governments turn a blind eye- e.g. ransomware gangs. So, if you don't have to fear the government asking questions, but the people paying you might (or if you want the people paying you to not be able to find you), there could be a reasonable use case.