IMO, EdTech has failed because it's BS. I'd sooner buy GameStop stock than the next EdTech-in-schools startup. (EdX, Khan etc. are playing in a different market, and doing ok.)

But sex ed and the like is definitely something that gets parents upset, as is the general concept of "they're teaching my child things they're not telling me about", whether that's critical theory, sex ed, evolution, or anything with the word gender in it.