[Question] Why were people skeptical about RAISE?

RAISE was a project that was aiming to build an online course for AI safety. It shut down because their attempt at a study didn’t show any significant improvement, but I know that some people were sceptical of the project goal, not just its failure to achieve that. What was the worry here? Was it related to excessively growing the size of the field, the idea that anyone capable of significantly contributing wouldn’t need an on-ramp, the choice of topics or something else?