Being scammed in one way or another seems inevitable, what are the clear indicators that a legit-looking service is actually a big scam of some sorts? Is this forum a good place for info to detect a fraudulent scheme?
You should first start by looking at the trust profile of the concerned user because because usually DefaultTrust members leave negative trust on their profiles when someone opens a scam accusation about their services. If the service is new and looks legit as a start then there is no way to know for sure but you could use your logic , If it's a trading website for example then you could measure the trust by the effort that the developers has put on it , If the design is bad as hell , the domain name is free or not professional , no HTTPS , low domain age , all those indicate that the website is not planning to run for long term and run with funds.