You could just mail them the equivalent value of beanie babies as well. Crypto doesn't give you a magic wand to waive taxes, forms, and all the other bullshit, you're just deliberately breaking the law by doing so. Which again, you could do with a couple of pallets of beanie babies, (or say a single signed honus wagner baseball card). The advantage of those two is that they still exist when the power goes out and they don't leave a digital trail for the feds to follow.
Could you buy said property with a pallet of beanie babies or gold or what have you? Sure. You'd need to store it at no small cost, ship it, protect it in transit from thieves, have it authenticated on delivery (so you know it's not counterfeit, gold plated lead, etc). That's far more costly and time consuming than cryptocurrency.
In terms of power outages...if the power goes out for a long time on a global basis, then crypto is worthless and you need ammo, MREs, and probably a geigee counter since we're now living in a nuclear wasteland.
The value of crypto can plummet with the world going into nuclear wasteland territory. There is no underlying value to crypto, and without some sort of central authority to prop it up, it can easily crash to zero or at least continue to have such wilds swings in value that it becomes a major obstacle to use as a currency. It is wildly popular as a fad now and prices reflect this, but at some point the fad is going to die down and the price is going to drop again. If the best point you can argue in it's favor is it makes international transactions slightly easier by avoiding exchange rates, what you have is a slightly easier to transport form of baseball cards.
Slightly easier? You can walk across a border with a billion dollars in crypto as easily as one dollar. The same goes for transaction costs.
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