Oracle has humorously called out RedHat for a recent broken promise to the open source community.
But, Oracle is best known in the Open Source community for their purchase of Sun Microsystems resulting in Sun's massively successful open source database MySQL going from the #1 database in use in the world to not even cracking the top ten.
Many factors contributed, but most notable was a sudden drop in servers available to serve the documentation and help pages for MySQL.
Oracle (coincidentally?) makes a great deal of money from their closed source Oracle Database. An inferior (in my opinion) direct competitor to MySQL.
It's entirely possible that Oracle did not buy Sun Microsystems with the sole intent to kill off the most popular open source database of all time.
For those who agree that Oracle might be totally innocent in that, I agree it's possible - and I have a bridge I would like to sell.