perhaps the fads and trends that drive huge amounts of VC investment and disappear a year or two later? Currently it's blockchains and AI, but previous iteratio

perhaps the fads and trends that drive huge amounts of VC investment and disappear a year or two later? Currently it's blockchains and AI, but previous iterations have been IoT, social, local, chatbots, and so on. Often these technologies are hyped way beyond their actual practical applications.