If that were all that was going on, then Oracle would just provide funding and engineering support to CentOS.
Since you aren't doing that, one of two things must be happening:
1. This is part of a long term strategy, which means it will somehow make a play for my wallet on some future date.
2. This is not part of a long term strategy, which means it is a low-level initiative. Most likely it will chug along until the responsible middle manager retires, transfers or gets bored with it. If by some happenstance it becomes successful enough to attract the attention of top management, then goto #1.
Bottom line - Oracle is a business and wants my money. I know it, and you know it. Using free products from Oracle is like accepting a favor from Tony Soprano. Sooner or later, the bill comes due.