You can use iCloud without an account? Is iCloud available outside of Apple ecosystem? Otherwise it doesn't seem very relevant since its not a general solution.
Yes, you're right, this only works for Apple devices, so going cross-ecosystem is definitely a benefit of their subscription service! I disagree on that meaning it's the iCloud solution is irrelevant though, skipping the $36/a year, and the additional control over your data not being on a subscription entails, seem like relevant benefits for the people who fit those requirements!