I don't think it's news to anyone that money always depreciates. This is due to the fact that money is not a way of storing value, but a means of exchange. Most ordinary people confuse this feature.
Please note that the rich people of the planet don't keep their wealth in money, but keep it in gold, real estate, enterprises and shares of various companies + some in bicoin / crypto.
It is not worth comparing money and bitcoin. In this they have completely different purposes. Although in the beginning bitcoin should have become an alternative to money, but as we all can see, BTC acquired a different purpose as an investment instrument.
I would say that money is means to exchange value but at the same time it doesn't "have to" lose value neither. Doesn't mean it needs to get more valuable neither but there is nothing that says means of exchange needs to drop in value neither.
So, people are getting more mad about the current situation because they are losing so much money whereas they are not making that much more. Imagine USA, we had minimum wage salary crisis in USA and everyone talked about 15 bucks should be minimum way before this inflation, now it should probably be 20+ if you ask me per hour.
However they do not have it and politicians didn't agree on it and it is still a bit over 7 bucks in a world where there is inflation. So, it means that fiat doesn't "need to" lose value, but in a world where people still make very little salary and not increasing, it is silly to accept fiat being so worthless all of a sudden.