Perplexity might have been a wrapper some time ago, but today, it's far more. I tried asking it for the meaning of the lyrics of a certain song in my head but only gave it the band name, not the song. It picked the wrong band-song at first, but noted that similar questions were asked for the exact song in my head. If I ask GPT/Gemini/etc, it will say, "I know the band, but which song?"
I think this sort of invalidates the rest of the question - most of the things that people just assume are wrappers are not. The things that are only wrappers die out pretty quick because people would just ask ChatGPT instead of Essay Writer 2025.