Those criteria are so vague that they could apply to all technologies; or none of them. What separates a tech from another, who's considered to be a enthusiast

Those criteria are so vague that they could apply to all technologies; or none of them. What separates a tech from another, who's considered to be a enthusiast and who isn't, what is traction and when is it mainstream, at what point does a pile of money stop being insignificant, ...