This fallacy the same thing that happened for the word "Disrupt"/"Disruption"/"Disruptive Technology". Even Clay Christensen, the creator of the phrase, says most people misuse the phrase "disruption" when compared to his explanation in the Innovators Dilemma[1]. There are Tons[2] of[3] people[3] complaining that the term is misused. In the end, if you casually tell someone you've got an idea for a Taco Food truck that's going to disrupt the food truck industry, people will know what you mean.
The definition of this word "blockchain" is being misused so much that it is changing faster real eduction can help. I think posts like this are great if you're technical, but as I said above — It doesn't matter what the fallacy is.
[1] - https://www.amazon.com/Innovators-Dilemma-Revolutionary-Chan...
[2] - https://techcrunch.com/2013/02/16/the-truth-about-disruption...
[3] - https://www.forbes.com/sites/vukivujasinovic/2017/03/02/its-...
[4] - https://www.newyorker.com/magazine/2014/06/23/the-disruption...