Why would any of this be made illegal? It's a jurisdictional enforcement issue, that isn't targeted at the asset - it's targeted at the individual who thinks they're going to make large financial transactions and not meet the KYC requirements - which will come up when you have to declare how you attained a whole lot of assets or cash to the IRS.

Of course, you could not do all those things...but it would be just as illegal and lead to you being just as in jail (and your assets seized) as it would for any other currency.

So sure: technically you can hide a bunch of stuff with BTC, but you can do that with USD just fine too (cash is pretty untraceable). The moment you get caught though, you're just as screwed.