To offer some perspective, the 'world' does not see Bitcoin as a scam now nor were they uninterested but because many people do not know of its existence. If you are someone who uses or was raised with the Internet it seems impossible that there are still people who are unaware of Bitcoin or cryptocurrency so maybe you feel safe to assume that people who do not use or buy crypto think it's a scam or is not interested. Many people in my country are only coming around now about the concept of digital wallets, so even if Bitcoin is around for over a decade, it will take longer than that to fully make people aware of its existence and much longer to educate them about its advantages and how to not fall for scams and frauds.