Due diligence on the investors part is one solution. Some ICO's fly with just a white-paper and nothing else. These guys even get upset when you ask relevant questions and seem to forget that they are asking for money. If all the investors started asking for financial spread-sheets and projections, it would be immediately obvious if the ICO's goal was over-capitalization. You don't need 200 Million for a venture if it can be achieved with 1.5 Million and 200K for unforeseen events. So 1.7 Million is all they need.

They can even have a second round of fund-raising if it is required later on. This way investors can see the progress made compared to the projections made previously and even have a rough idea of their expected return on their investment. If all is well then the second round can be started.

If the founders over estimate the worth of their project, these financials will bring them back to earth. Blatant over-capitalization is a well known red flag. You could check out a Prospectus from a real company running an IPO to see what I mean.

To bring expectations back to reality, all you can do here, is start asking the hard questions. If you are not satisfied or they ignore you then move on. Your money is still safe.

The other solution is government regulation, which could be a bitter pill to swallow in this space.