Deletion of Bitcoin Ponzi scheme and pyramid scheme concerns

Comment: I propose this article be renamed as "Cryptocurrency ponzi and pyramid scheme concerns." This article has a broader focus than bitcoin, athough much of the discussion is targetted at bitcoin. See https://www.google.com.ph/search?rlz=1C1CHBF_enUS761US761&q=bitcoin+ponzi+scheme&spell=1&sa=X&ved=0ahUKEwjEtKu51JjYAhWBu7wKHduiA6wQvwUIIigA&biw=1306&bih=847&dpr=2 and https://www.google.com.ph/search?rlz=1C1CHBF_enUS761US761&biw=1306&bih=847&ei=ymA6WtWXM8L28gXgnLjYCg&q=cryptocurrency+ponzi+scheme&oq=crypto+ponzi+scheme&gs_l=psy-ab.3.0.0i7i30k1j0.18610.19731.0.21437.6.6.0.0.0.0.251.874.2-4.4.0....0...1c.1.64.psy-ab..2.4.873....0.zgTDJ1KCDUM with about 2 million google hits between them. While they are not all , there certainly is enough to pass 
Stance: keep
Cited policy: Wikipedia:Reliable sources (WP:RS||WP:GNG)