If we just use analogies, comparisons to discuss some FEATURES we can use ANY analogy which can help to understand us.
We can say that cryptocurrencies are trees. They have some similar features.
You might say that cryptocurrencies are like trees, but that doesn't help you to understand them. Saying they are like stocks does help you to understand them because this is a useful analogy - they have broadly similar attributes and behave in a broadly similar way.