It's an interesting idea for a thread post I suppose though it's a somewhat lofty goal. This thread would be pages upon pages long if people reported all spells thought to be fake as well as known to be fake as this site hosts plenty of fictitious spells plus some might report spells that are actually legitimate that they may personally feel are fake. Sadly, at this time fake spells cannot simply be deleted from the site and as such they have grown in number over the years though many are obvious in how they are fake. I mean a few are directly copied from books, movies, tv shows, etc...while others are simply impossible within the boundaries of our reality. I can understand your desire to separate the fake from the real though this does not seem to be the most accurate nor efficient way to do so. Do you have questions or concerns about a particular spell?
It's hard to go through them all, you can use a shorthand and assume if it's in the Fantasy or Trick sections to fake because that's what "Fantasy" and "Trick" mean [make believe or to fool] but you also have to consider spells that are just flawed by design [love spells work, but what if the love spell calls for a purple candle, and claims it's best done during the waning moon when energy is flowing away? By design this spell would be challenging] as mentioned above one of the reasons why the comments were added to spells was to point out if it was fake or not. You can also flag spells as spam [though the admin are so busy they rarely get taken down unless they're harmful or break site rules] downvoting is another option [but I've noticed a glitch where I vote a 1 star spell at 1, and it regresses to a 2 star rank. Might want to look into that people]
Overall, I would do some quick research on magick [like one well written article should be enough] and use your common sense to determine if a spell works [luck spell] or doesn't work [transformation] when it comes to spells that are written poorly it takes practice to sort through them.
