As an aside, I've looked at Oracle Cloud before, and pricing definitely seems favourable compared to the big 3, and IIRC they even include a good chunk of bandwidth for free. But... I just don't trust Oracle. Now, it might well be that Oracle Cloud is completely separate from the rest of Oracle, in which case I might be more tempted - anyone here work at Oracle Cloud and can share, even with a throwaway if you're too embarrassed to admit to it? :P
There are better and worse orgs and managers as you would expect of a company of that size.
As far as I can tell there was literally no specific "Oracle" culture. Some of the well-known cultures attributed to "Oracle" may be true of specific business units like Oracle database or ERP but it's hard to say without having been in every one of those business units. But my adtech business unit was nothing like the nightmare/FUD stories you hear online.
Also not hard to imagine the whole cloud getting shut down and/or sold to Salesforce (and shut down)