Interesting graph. Of course it's saying a lot more about fiat currency than about bitcoin. The graph would look about the same with almost any commodity, stock, real estate, ... and so on and so forth. It would look the same (exponential shape) for any state, and crucially, it would look the same even if you went back centuries or even millenia.

The only real conclusion to draw from this is that governments have always spent more than they claim to spend, and they've always made up the difference by cheating with your money. The ancient Faraos did this, the Roman Senate and Emperors, the Athenean democracy did it, the Communists (Russians and Chinese) did it, and modern democracies do it. They've all been doing it this way, and for multiple millenia.

TLDR: Don't store wealth in fiat currency (or gold currency). Almost anything else performs better. This should not be news to anyone, but surprisingly few people seem to have realized this.