We can only speculate, but Zoom is really big in the news right now, so Oracle could have offered them a special deal so Oracle can be in the news too. If you

We can only speculate, but Zoom is really big in the news right now, so Oracle could have offered them a special deal so Oracle can be in the news too. If you aren't knowledgeable enough about cloud providers to evaluate them directly on their merits, then you look for signals. Some people might think, hey, Zoom is doing well, they are a well-known, up-and-coming company, and they chose Oracle, from which we infer that Oracle must be good choice.