1. "Oracle does not do employee appreciation events" is not the same as treating staff badly. Events like that have all kinds of frankly important accessibility and inclusion concerns that are tricky to handle. Not saying it's the choice I would have made, but I think it would be fair to, rather than navigating that poorly and leaving some people unhappy, simply not have a budget for that type of event and (theoretically) fold that into salary. After all, those perks are technically part of your comp.

2. The fact that you segment technical staff from other staff is exactly the kind of tiered treatment a blanket policy would seek to avoid.