I've been getting an "Oracle is evil" vibe lately (duh). I've brought it up with a few people, but it's always essentially come down to being in a band-wagon, or wanting free (as in beer) software. I respect the opinions on HN, and I have to believe there are better reasons than this, I just haven't heard them.
Personally, I know several people who worked there during the acquisition, and there's an overwhelming response of relief that their company isn't being run into the ground anymore. I've always had good experiences with Oracle's products and support, and I'm not aware of any free products that are no longer available (maybe I'm wrong?) Open-source software can still be branched if people don't like the politics (like LibreOffice).
As far as I can tell, Oracle is simply not going to spend money on things that it doesn't benefit from. It's a business, and they're not breaking any contracts or laws. Granted, their lawsuit against Google looks ridiculous, but that can't be all there is to this vibe.