Fuzzy search

Reverse dictionary

Stack Overflow clone, except you're guaranteed to get an unreliable answer promptly instead of waiting for a human to give it

OCR, with new and exciting failure modes

Machine translation, with new and exciting failure modes

Endless possibilities for exploiting the stupid and ignorant while destroying the web in the process

Note that only the first two are unalloyed good, and they can be done with embeddings without generative AI.

Replace search for one.