First official 7zip package for Linux released but no source code? https://www.bleepingcomputer.com/news/software/7-zip-developer-releases-the-first-official-linux-version/
@nikolal Igor Pavlov (developer of 7zip) indicated in one comment that 7zip for Linux would have the same license it already has, LGPL. It seems he just didn't want to release the source yet in order to polish everything. After all 21.01 is an alpha version and there is also some trouble with compiling it on some platforms.