Oracle is one of the leading researchers in JIT compilers, garbage collectors, and language interpreters.
How does working for Oracle compare to say working at Facebook or Google with all their privacy invasion tech?
Facebook is also on my personal blacklist, yes. I don't feel as strongly about Google personally, but I wouldn't argue if someone else on the hiring team felt it was disqualifying.
But that said, I think it would be dumb to jump to conclusions just based on having Oracle on the resume. You should at least ask them why they worked there, and why they left. For all you know, they had no idea how bad Oracle was when they started, and they left because they saw how evil they were. That is the exact kind of person that I do want to hire
[1] https://en.wikipedia.org/wiki/Google_LLC_v._Oracle_America,_...
Interpretation on the fact and metric and the need to tell I leave up to you