I've bought actual stuff I liked on Internet with crypto (the only other option was PayPal which is blocked in my country).
There is sure a lot of dirty things going on on crypto but there are definitely totally legitimate use cases. You can gamble with fiat, you can gamble with crypto.
You can donate/buy with fiat, you can donate/buy with crypto.
I'm an opportunist who is in web3 and NFT space too, which is literally a free economy, and no one has to participate. Anyone can happily buy their NFTs if they find a value in them, and anyone can use crypto to transfer/donate money or buy things. Things can surely crash, so can fiat, stock market, or whole country economies.