user81182: Is there a scientific survey/ publication/ paper about how many of the 1597 cryptocurrencies/ blockchains listed by coinmarketcap.com or similar, might be scam, have failed or are not even developed? 
I wonder how many of those hundreds of blockchains around might be serious projects. 
Blog entries or estimations might also be useful to me, but I would like reliable information.

user81190: Bitcoin.com

Having completed an extensive study into last year’s crowdsales, news.Bitcoin.com can report that 46% of them are effectively dead already – despite raising over $104 million.

Satis Group's Cryptocurrency Research

On the basis of the above classification, we found that approximately 81% of ICO’s were Scams, ~6% Failed, ~5% had Gone Dead, and ~8% went on to trade on a exchange.

Lastly, Bitcoin.com also mentions that in an MIT-authored research paper, Initial Coin Offerings and the Value of Crypto Tokens, it was "found [that] only between 5% to 25% of ICOs are frauds." However, I couldn't find evidence of this claim in the paper mentioned.

81182: <p>Is there a <strong>scientific</strong> survey/ publication/ paper about how many of the 1597 cryptocurrencies/ blockchains listed by coinmarketcap.com or similar, might be scam, have failed or are not even developed? </p>

<p>I wonder how many of those hundreds of blockchains around might be <em>serious</em> projects. </p>

<p>Blog entries or estimations might also be useful to me, but I would like reliable information.</p>
 81190: <p><a href="https://news.bitcoin.com/46-last-years-icos-failed-already/" rel="nofollow noreferrer">Bitcoin.com</a></p>

<blockquote>
  <p>Having completed an extensive study into last year’s crowdsales, news.Bitcoin.com can report that 46% of them are effectively dead already – despite raising over $104 million.</p>
</blockquote>

<p><a href="https://medium.com/satis-group/ico-quality-development-trading-e4fef28df04f" rel="nofollow noreferrer">Satis Group's Cryptocurrency Research</a></p>

<blockquote>
  <p>On the basis of the above classification, we found that approximately 81% of ICO’s were Scams, ~6% Failed, ~5% had Gone Dead, and ~8% went on to trade on a exchange.</p>
</blockquote>

<p>Lastly, Bitcoin.com also mentions that in an MIT-authored research paper, <a href="https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3137213" rel="nofollow noreferrer">Initial Coin Offerings and the Value of Crypto Tokens</a>, it was <a href="https://news.bitcoin.com/80-of-icos-are-scams-only-8-reach-an-exchange/" rel="nofollow noreferrer">"found [that] only between 5% to 25% of ICOs are frauds."</a> However, I couldn't find evidence of this claim in the paper mentioned.</p>
