It's not like the Wolfram Language examples you see are independent of the Wolfram KnowledgeBase or their other cloud services, and you have to leverage it from some deployed product (like Mathematica) you're paying for. This detail is sort of glossed over.

You can do some of it from free-to-use services like Alpha.

Also, good god does he love to take credit. There's whole teams of people who work on the underlying technology that powers it, although he does credit the guys who come up with algorithms that they use, especially when documenting them, but you have to dig for that... and then there's the people that gather, purchase and curate data sets that power the Knowledge Base, and even the SMP engine that became Mathematica was a group effort...

Which is why I'll never pay for a Wolfram Research product, as interesting as or powerful as it could be. All it does it serve to support the legacy of an egomaniac.