Is it safe to invest into new ICOs?


Hi everyone. I’ve been looking into new ICOs, there are a lot of interesting projects which are on the early stages and they don’t have an actual product yet. I’ve seen many times that many companies offer pre-ICOs with a significant bonus but they also require big amounts of money to invest. So how safe it is to invest into presales? Has anyone tried to do it? I suppose it’s a long term investment and it wont bring any profit in near future? Share your thoughts and experience!