@412b: standard rules for /opt is that every 3rd application will install data to /opt/<app_name>/. This comes from UNIX.
/opt/<package> or /opt/<provider>
The directories /opt/bin, /opt/doc, /opt/include, /opt/info, /opt/lib, and /opt/man are reserved for local system administrator use. Packages may provide "front-end" files intended to be placed in (by linking or copying) these reserved directories by the local system administrator, but must function normally in the absence of these reserved directories.
But there is no special reason.