The difference is that the Internet was actually useful technology, whereas AI is not (so far at least).

I think you're exaggerating a little, but aren't entirely wrong. The Internet has completely changed daily life for most of humanity. AI can mean a lot of things, but a lot of it is blown way out of proportion. I find LLMs useful to help me rephrase a sentence or explain some kind of topic, but it pales in comparison to email and web browsers, YouTube, and things like blogs.

More use cases for AI than blockchain so far.