Like V for Vendetta, if you must know the cause of the BITCOIN failure, you need only look into the mirror. So say 'V'
Greed - It goes without saying that the original satoshi-btc, was about privacy, anonymity, and being your own bank. Today BTC (core old farts) have sold us out, and bent over to every request by GOV to track bitcoin, and make it into a 'chain', be your own bank my ass. Why did they sell us out, because they got rich, they were promised riches BTC to the moon, if you cooperate with the FBI, CIA, IRS, FATCA, ...
Government- The USA gov is the mafia; They control the planet, and force it to accept their worthless toilet-paper, also known as saudi-petro-dollar; The original satoshi coin understood all this well, the entire premise of early adopters of BTC was to bypass the "EVIL FIAT SYSTEM"
Fraud- While once upon a time all of us early crypto people were indeed 'programmers', roll our own, rolled up the sleeves, we could all not only read C++, but we could write it too. Most programmers of the era, came out knowing well about crypto, in those times prior, even owning 'cryptography' software the GOV couldn't break, as on the books as same owning a 'bomb', you were a terrorist, if you even wrote crypto that the NSA couldn't break, if you exported that software, you could spend the rest of your life in a small box.
Then something magic happened post 2014, all the worlds criminal's, con-artists, and scammers, and just common-evil people learned about bitcoin, and how it could make you rich. Now the fact that US-GOV is composed of the most evil people on earth, its not a jump to conclude that most of the greed on BITCOIN evolved from GOV operations to pump&dump, and bring it to the outcome we see today, which is a loss of privacy, and that BITCOIN has just become another 'commodity-virtual' like GLD on the stock market, just another way to siphon wealth out of weak-hands.
The history of BTC of course goes back to 1997, when the BIS-IMF released the original white-paper 'how to make a digital bank', then in 2009 Satoshi released his white paper, which is 90% the same paper, but satoshi doesn't even cite this paper. Then Satoshi releases 'his' software, which uses SHA256, and SECP256k1, both NSA algo's, of which NSA holds the keys, as since 1950's, NSA has never made an algo public, where they didn't hold the back-door key. Fact.
Then the mythology continued, not surprisingly given that all this crap came from BIS, that it had to be sold as 'anti-bank' even though it was created by the bank of all banks, the BIS in Switzerland, a private group of people going back to the 1920's, same group that setup the FED-RES-BANK in the USA in first place in 1911. ( Bank of International Settlements )
So then you had the good years 2009-2012 where only geeks played BTC, then of course 2014 it went Fraud-SCAM, and then 2016 it went super-scam, robbing exchanges, ... 2017 parabolic & collapse, to today rinse & repeat, parabolic & collapse.
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The good news is the BTC SW was open-source, and it got hacked, and out came ETH, and lots of privacy coins like Monero, and zSnark, so all it not lost
There is still time to have a real 'crypto' that say's F*CK You to the BIS/IMF, & NSA; There is still time to have a private crypto to say F*ck-You to the exchange gate-keepers that now control the on/off-ramps of crypto.
But BTC is dead, its just the King of All Shit-Coins, and its utility by the people who created it, no longer need it, now they're desperate to get the other 9,000 alt-cryptos under control. The early logical move was to get all the 'sheep' in one place say 'bitcoin' that has failed, while lots of people are dumb, lots of people made side bets on real alt-privacy coins.
In the recent years the alt-privacy coins have made much more ROI than BTC, but these are things that go unsaid in the world of BTC bullshit.