I always thought that when a project delays its implementation for many years, it often leads to nothing good, but we see the opposite, the team worked hard for a long time, and in the end we see what a successful project it turned out to be.
That totally depends on the how reliable the team and development progress that has been made. ICP is not the first case but i can tell you some coins that were doing the same thing like ICP.
if you know about file coin and this coin needs a few years to be launched in the market and it was giving very good result to the all of ico buyers.