It's not used in business because it's not popular. One of the two factors that hinder its popularity is the friction needed to set-up a proper development envi

It's not used in business because it's not popular. One of the two factors that hinder its popularity is the friction needed to set-up a proper development environment and the learning curve that one has to take to master it. - To code effectively one has to learn how to edit at the sexp level rather than at the word level. - The only free editors that provide proper debugging and repl support are the ones that offer a plugin for Swank. Amongst these the best two are Emacs and Vi(m) with Emacs that has an advantage in terms of additional support for CL. - Installing and configuring properly all the above requires some work. - There have been recently attempts to mitigate this (e.g. Portacle) but in any case one has to learn Emacs (or Vim), Swank commands and a Lisp supporting mode such as lispy,paredit,parinfer, etc. - Windows is a second rate citizen: there is no free Windows implementation that allows to step native code. Emacs is a second rate citizen on Windows as well. (This is mitigated by the fact that SBCL runs on Windows Subsystem for Linux). - The commercial implementations are very good but expensive. Now compare all of this with the typical developer that just downloads Visual Studio code and starts to write Javascript on Linux, Windows or Mac. All of the points above are of course not insurmountable but require some investment in time. One has to take a couple of weeks to start to become proficient in all above. The typical young developer doesn't have this patience. This is exactly why CL is more common amongst who uses Emacs already: if you master Emacs the jump to CL is almost consequential.