Speculating on cryptocurrencies is fine if you recognize that is what you are doing just like speculating on any other currency. There is no underlying economic activity to support viewing currency speculation as an investment other than converting electricity to heat.
If what you are trying to say is that cryptocurrencies don't actually do anything, that's false, depending in which cryptocurrency you are talking about.
If you are stating that cryptocurrencies have no inherent
tangible value, that's true. Most currency transactions are digital and not directly based on "work" anyway, and the argument that I see often here that there's no economic force guaranteeing the value of bitcoin et al isn't true. It's just diffuse and decentralized (at this moment, anyway).
There is plenty of economic activity driving cryptocurrencies. What bothers people is that it isn't coming from the traditional fiat currency model, but is instead
closer (admittedly not the same) to what we saw prior to the rise of government-issued fiat currencies, with individual banks and institutions being the guaranteers of value. Bitcoin and other blockchain technology is all about shifting trust. I think inevitably we'll see more of a push back to centralization and crypto won't be perceived as being at odds with governments (and many are co-opting the tech, as are intergovernmental bodies), but it takes time.
So while we are in a wild West of sorts with cryptocurrencies right now, it doesn't mean they aren't "real" money. It's not Monopoly money when it takes real hardware and power to produce it.