What's there to be cautious about? Crypto space is opened for new ideas and they are welcome at any time, we only need to figure out which project team are serious about what they introduced, ICO, IEO, DEFI all have high quality projects backing them up so new ideas are highly welcome.
Don't be naive. This isn't like some place where you can get your money back when you fucked up, this is the internet. You need to be cautious of everything. The market is already saturated with scammers and some money grabbing projects. This is a decentralized and anonymous place, if you are not cautious, You'll lose your money in no time.
Yes new ideas are welcome but that doesn't mean this ideas has good intention. You don't know who you are dealing with so you need to be always careful and mindful of what you are going to do.