This question has been raised several times, and I have noticed that some people conclude that the lack of adoption is due to people not understanding Bitcoin or seeing it as a scam.
But I don't think the world still views Bitcoin as a bad thing today, though I know a lot of you thought that, but it is not the case.
I feel the reason for the low rate of adoption is just because people think it's not for them. Bitcoin has been around for over a decade, and any thought that most people would have had about it being a scam must have faded by now.
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Bitcoin is a tool, and like most tools people are only going to use them when they think they need them, we know that fiat currencies are scam and the longer you hold them the more of your wealth you will lose against inflation, but people are simply used to this process already, so we will need for the inflation to become more notorious before people begin to consider other options, and once they begin to consider their options then some assets will be at the top of that list, and we know that one of them will be bitcoin, and when that happens then the adoption will grow at an astonishing rate.