1) People Can Live Without Crypto
2)Traditional/Legacy Systems Are More Convenient Than Crypto
These two things aren't the only reasons. But they play a major role. Some people just live on Facebook ad other social media. STEEM doesn't even offer most of the features of traditional social media (which is a good thing that leads to less vanity on the platform) But when it comes to Bitcoin, it doesn't offer something unique like smartphones or tabs.
Crypto are like just electronic payments with added complications like no limited account recovery etc. If you are living in Venezuela you really need crypto. there are over 1800+ merchants accepting Dash over there and other cryptocurrencies are also significantly used. But most developed countries don't face hyperinflation and only a small percentage of people get their accounts closed by centralized entities.
Currently crypto is like a PDA. We need an iPhone to really kick things off.