Absolutely not, no. At least not any more than LaTeX is a cloud based solution with monthly fees (Overleaf)
The language, ecosystem, and compiler are FOSS. There is a cloud editor / collaboration platform that is paid, but nothing about the language requires that you use it (I use it almost exclusively through emacs)
The language, ecosystem, and compiler are FOSS. There is a cloud editor / collaboration platform that is paid, but nothing about the language requires that you use it (I use it almost exclusively through emacs)