...
Bitcoin is the best alternative way to save money, with Bitcoin you have control over your savings because it's your wallet and your key and you are your banks!
Not to mention that it is difficult to carry substantial amounts of fiat, silver, gold etc over a border if you have to flee someplace like Venezuela, Germany in the 1930s, Russia at the time of the Russian revolution (under Stalin, Lenin, or even today), China under Mao, etc. There are statists and authoritarians the world over who want to force you to pay for their choices, protect yourself.
We all know that there were several times in history when government expropriated gold. And crisis time is most suitable for gov to take such decision. And if so it will be not so easy not only to exchange your gold but even to keep holding it. Each asset you try to use for savings have its own disadvantages. For instance if you'll be forced to flee from your home it will be harder to take your gold with you than to take several hidden words hiding your bitcoins. Of course it is not an ideal variant as well, but gold isn't too.
This hasn't been done in any of the democratic nations for a long time now, I can't remember last time this has ever happened, not in my life time at least, sure maybe in nations like china or Russia it could have happened because they are run with dictatorship, but can't remember any west nation that took peoples gold and used it to make the nation "better".
In any case, gold is still not that good compared to bitcoin, even if no government ever takes your gold bitcoin is still better in the end, since at the end of the day we are talking about bitcoin being better than gold when you compare them at default levels. Bitcoin is better than anything to be fair.
Part of the reason it hasn't happened is that fiat is no longer backed by silver or gold. It is backed by nothing except the whims of a government. Look at Cyprus 10-11 years ago, since few people had gold or silver and the euro (like the dollar) is backed by nothing, they just gave everyone's bank accounts a haircut. They didn't have to expropriate gold or silver. If the euro had had silver or gold coins or even been backed by a PM things would've been different. Like when the democrat president (FDR) expropriated gold in the 1930s and devalued the dollar. Once the full tie of the dollar to silver and gold was lost in the 1960s and 1970s, it is only a matter of time before the value of the currency is completely lost.
With no anchor to fiat, they can inflate value away, expropriating it by a slightly stealthier method than outright seizure.