Unfortunately when you invest in an ICO you are completely at the mercy of the honesty of the people behind the project. I would recommend that if you do invest in an ICO you find out a lot about the people involved and ask them some very hard questions before you invest. Make sure they are who they say they are and that they actually have the skills and track record of success that will give you confidence they will be able to complete the project and manage investors funds properly. You would be amazed at the number of ICO's that raised large sums of money on the back of an empty Github and a flashy website and then disappeared with investors money.