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.
In my country during the reign of the popular moribund Ponzi scheme MMM the scheme initially adopted Bitcoin as a means of payment, however when they scheme went bankrupt some people then became skeptical about authenticity and credibility of Bitcoin with a perfection of being a scam it's takes a lot of orientation and enlightenment to those people so as to disassociate Bitcoin from the fraudulent scheme,
The confusion is caused by the representative and members that present the marketing plan of MMM. Obviously, Bitcoin has nothing to do with the company, Bitcoin just like fiat currency is just a tool or currency to pay for the membership. But most of the representative explains that the possible profit generated from their subscription or membership comes from Bitcoin trading. That is where the confusion started and many MMM member thinks that the company MMM and Bitcoin is in cahoots with each other.
however with time a lot of people began to adopt Bitcoin by investing, trading and staking as well as utilizing all sorts of opportunities associated with Bitcoin like P2P merchanting with Binance etc, while some set of freelancers in my country also adopted Bitcoin as their payment gateway.
In case of confusion, time is really needed to fix the misunderstanding. Little by little as people are getting enlightened that Bitcoin is not a company and does not have central authority, the accusation that Bitcoin is a scam fades each day.