I see many people bashing Oracle/Ellison, but they are not alone in this. MS does the same thing as well. The really worrying thing is that such practices are deemed to be legal. The entire principle of Free Markets is underpinned by consumers having accurate information about the goods they are purchasing. Having licensing agreements that are expressly designed to prevent the dissemination of product-information, goes against everything that Capitalism and Free-Markets stand for.
The fact that there are no government regulations against such behavior, is precisely what leads people to think that we are living in a Corporatocracy, and not a Free Market.
I know it's a lot of work, but anyone whose business is dependant on database performance needs to know how the system will perform with their data and their use cases. I think they would also like to put some effort into working with the database to see how well the associated tools work. It would be nice to have synthetic benchmarks to review as a starting point and I suppose those exist for the open source engines such as Postgres, Maria and MySQL. It should be safe to assume that Oracle and MS-SQL are at least as fast and a little testing should verify that.