1) It's GPL'd so nothing is stopping you or anyone else from forking it away from Oracle.
2) The Open Watcom compiler is not required to build VirtualBox at all. The actual compiler is free for anyone to download and use.[1]
Other people here raised some legitimate points with the build and patch submission process that I also would like to see improved, but yours are just narrow minded prejudice.
Please tell this to the Debian team (that they're narrow minded and prejudice) because I'd like them to move VB off of contrib (non free) to their free repos.
Other people here raised some legitimate points with the build and patch submission process that I also would like to see improved, but yours are just narrow minded prejudice.
[1] https://www.virtualbox.org/ticket/12011