More of a tip for adults, but maybe it can be adapted for kids?: to think what could be the intention behind the intention
For example, in a video where the content creator promotes a gacha (gambling) game, one could ask, "why would he/she do that"? Likely to promote it. But "why would he/she want to promote it"? Likely because he/she profits from it.
It's not a fail-proof method, but it helps seeing tendencies and attempts at social engineering, both in places you'd be normally against, or even in places you'd root for.