The problem is they don't.
It's pretty trivial to break orcaleSQL from a security standpoint. If and when you report a major issue, it'll be fixed in 2-3 years, and only the issue you outlined.
For example. I submit a bug concerning parsing, utf-8 backslash not working. Orcle will fix the bug for only that utf-8 code point, and not all other utf-8 points that also cause the bug. It'll also take them 1-2 releases and they may not back port it. 1