Only slightly less mainstream than the "crypto" answer everyone has, is the whole "bots" revolution that was supposed to happen in 2016, then 2017, then 2018; a

Only slightly less mainstream than the "crypto" answer everyone has, is the whole "bots" revolution that was supposed to happen in 2016, then 2017, then 2018; and the related FB Messenger and Slack bots store. There had been pretty much no killer apps on FB Messenger or Slack (yes there are a few profitable ones and some businesses built on them, but nothing like the mobile app stores from back in the days). If you were in the "bots communities" (on various social networks) like I was, you'd see that most entrepreneurs simply try to profit off of the rush by building "easily build a bot" services. (e.g. the Chatfuels of the world) I think it's an example where more people try to sell shovels than actually mine for gold.