Is Lisp being used today for anything particularly significant, like C and JavaScript are, or is it merely a niche academic language, like Haskell and Rust?
If you consider Rust an academic language, you are quite a few years out of date.
The language is in production at Google, Facebook, Amazon and Microsoft (including making it into the Windows kernel), and is slowly being included in Linux as well.
Rust has been a practical language since the beginning. Not every experimental stuffs are academic, especially when concepts are not rigorously formulated. Rust has been a rolling language ever since it was created, so is hardly formal.
If you consider Rust (is in the Windows and Linux kernels, powers Discord,...) a niche academic language, then I guess Common Lisp (used for the Grammarly backend, powers ITA software) is a niche academic language as well.
industrial theorem prover, design of Intel chips, quantum compilers...
and little me, being more productive and having more fun than with python to deploy boring tools (read a DB, format the data, send to FTP servers, show a web interface...).
