The definition of securities in the US is governed by the Howey test, which is over 75 years old. It's a test which is very well-established in case law, with a

The definition of securities in the US is governed by the Howey test, which is over 75 years old. It's a test which is very well-established in case law, with ample precedent that can be relied on to help fine-tune aspects like how "other" someone has to be in the "derived from the efforts of others" prong of the test. This isn't some vague unknowable thing.