Crypto (currencies) are not a scam. These are currencies and like any other currency are subject to devaluation and abolition.
So you're actually agreeing with me, that crypto currencies are not a scam. The number of currencies is also irrelevant even in a more colloquial sense. What's more important is how much is really invested in a given currency and the bad tokens are a niche. Ponzi scheme (or just new) coins are usually for gamblers and not in broad use and are comparable to jettons in a casino. Are jettons a scam in that sense?
The standard gambling that happens with "our current money system" can also happen with self-written IOUs. This kind of gambling isn't about the money, per se, whereas with crypto you get an additional kind of gambling on the currency itself.
I give you the point that it is harder (not impossible) to enforce any regulations on these currencies. It's like cash in that sense, but it has easy access and there are plenty of options of cash, which is unlike regular cash.
It's been a while since I took an econ class, but aren't all currencies, by definition, assets / stores of value?
Edit: Oh, you mean they're only assets but don't meet other criteria to be currencies?
Before eCommerce took off the internet was almost exclusively used for scams and arguably that is still the case even if not exclusively it's still a big part, so we should declare the internet a scam I suppose.
Disclaimer: I am not even heavily invested (in any sense). It's just a means to pay for stuff for me.
Yes and no. Modern currencies separate the medium of exchange and unit of account functions, on one hand, from the store of value and standard of deferred payment functions, on the other hand. Paper and deposit dollars are the former, Treasuries are the latter. Someone complaining about inflation eroding their cash under a mattress's value is literally using their dollars wrong.