Are There No Charlatans?

The tech sector is composed of human beings. Of course, there's a lot of bullshit around and lots of people hyping their thing, trying to get funding. And now the flip side, I feel like we've been putting tech with some halo or something like, are there no charlatans there? Are there no just really crappy technologies? The concern about climate change has filtered down from the C suite in the marketers and the PR department down onto the shop floor where engineers live.