Even if PokemonGo is in your terms a fad (what isn't if your definition of fad gets too broad?), it was wildly successful in its product category. I believe there is a misconception about the goal to achieve parity with a traditional search engine (what ever that means). Yes, it's part of a brand whose main product is a search engine. Bing Chat doesn't need to compete with a traditional search engine to prove its usefulness as we have seen with many examples. In the same sentiment of your comment one could also say a common tendency in (some) humans is to undersell the wins.