Considering a development language as a virus is a bit strange, but...
in the case of WritingTool it is about the runtime environment
computer viruses, in the presence of a JRE, work well simultaneously on GNU/Linux, Windows and macOS
at the beginning of the century, I met many PCs on Windows with several JREs installed at the same time... users updating without removing the old version --> security problem
an idea to reduce the risks: use a JRE in portable mode
the current LibreOffice database engine (HSQLDB) is in Java