While most of them don't run away with the money but they often don't meet the deadline and haven't released anything since the ico. You can see that there's a lot of icos from mid 2017 that haven't released anything and the same can be said from the 2018 one. They are just hyping people up, collect too much money and are too lazy to run the project now. Older project is better because the fund is limited and the other way to raise money is to raise the coin value by running the projects well.