First answer yourself what makes you feel why they are scam. Maybe the answer is obvious.
Check their team and previous experience. If they are new or no-names, I would start to be suspicious. How can a developer has nothing do display on public and promise success?
Check what they offer or are developing? Is this something new? Or another swap/exchange/dog (or other animal) related project? There are thousands of them already. They cant make 100x.
Think about benefits they offer for investors. Isnt it sounds to sweet? Remember, there are no easy and quick money in cryptocurrency, at least anymore.