You are spot on. After checking some recommended sites here (e.g. /r/appideas) it's clear that a lot of people just shitting out (for lack of a better word) ideas without half of a thought on execution. I think there are a particular kind of people who do this. The kind who wants to patent everything and always looking for the Next Big Thing™.

I have no solution for this other then focusing on the following things:

    - How detailed the idea is. The mere fact that someone took the time to think about it and write it down (1-2 page at least) is a good first filter that throws out things such as "It's like tinder but for job search".

    - Limiting it to "technical" people who has experience with actual execution of ideas and instinctively point out problems