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This summary chart presents a fact that less people wanted to call "Bitcoin is dead" with time. It is an unofficial recognition for survival of Bitcoin.
There is another website for "Bitcoin is dead" chart is
Buybitcoinworldwide.com but the team behind it stopped updating the chart recent months.
where did warren buffet or his friends go who once said bitcoin was just a bubble that would die and pop eventually lol. Until now there are no signs that Bitcoin will die, in fact every year there are many new people who enter Bitcoin, currently there are millions of people in the world who know Bitcoin.