Everyone can promise and write a nice whitepaper, but the reality is pretty different, when it comes to the creating a product, team recognizes that they are not enough skilled and so they give up, but with the money what they raised from investors. Solution? Before ICO is managed every startup should present their product and not the whitepaper 
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Even now, many projects that are already running have also updated their whitepapers and roadmaps. everything just didn't go as planned from the start. projects and platforms are of course adjusted to follow market trends. the simplest is the displacement chain network used. usually it wasn't all planned from the start. developers do so following market trends and need to remain in the market..