Not necessarily but very suspicious and risky. Research and background checking is very fundamental when it comes to ICO's and you should be careful on where to put you money on. There is very high chance that it would scam you so be cautious and as much as possible, stay away from anonymous teams. There are so many people who just takes advantage of people who aren't studious enough to know if an ICO is a scam or not. Don't be like those people and educate some for them to be able to prevent getting scammed.