But the question of what is a "security" has been clearly answered in 1946:
> For purposes of the Securities Act, an investment contract (undefined by the Act) means a contract, transaction, or scheme whereby a person invests his money in a common enterprise and is led to expect profits solely from the efforts of the promoter or a third party, it being immaterial whether the shares in the enterprise are evidenced by formal certificates or by nominal interests in the physical assets employed in the enterprise.
A lot of these coins are attached to some such scheme by a 3rd party, therefore they should be considered securities. This may even apply to most NFTs.
Source: https://supreme.justia.com/cases/federal/us/328/293/
Real estate fails the Howey test because there is no common enterprise.
https://www.compliancebuilding.com/2010/11/04/what-is-a-secu...
I believe the common enterprise exists no matter which coin, but with Bitcoin there was never an investment of money in its launch. Don't quote me on that though. I know the delta has to do with initial coin distribution.
Yet it would be absurd to call those toys "A currency". A currency requires more usage than occasional barter.
Because of POAPs, I use Eth as a currency all the time.