Liking, sharing or commenting on posts by your friends on social media is subjective.
People have or know what they have interest in. If you post a crypto-related post on social media, even if you have a million friends, there will only be few among them that will like that subject matter called cryptocurrency. Except all your friends are crypto enthusiasts, but this is not so common, most especially on Facebook and Twitter.
So many people have real followers on their social media and not bots, so, @OP, you cannot make such a generalized conclusion.

Take for instance:
If I make a post of my graduation in school or wedding picture/video on Facebook, so many of my friends would like and comment. in fact, I can have thousands of like. This is because they have an interest in my achievements in life, particularly in those areas, but coming to crypto-related matter, hardly will I have up to 5 likes.
The most important thing is for them to see my posts and with constant posting and reposting, without spamming, it will start registering in their memory, which might make them have an interest in it later.