You would say we can cut operational costs and modernize big data infrastructure while making our data warehouse more accessible(BigQuery). We can save money when APIs arent being used (Cloud Run). We can process real time data without increasing operational costs (Cloud Dataflow). We can debug systems failures faster (Stackdriver). We can launch products and iterate faster with a lightweight frontend team (Firebase). We can build conversational interfaces rapidly (Dialogflow).
You reword in terms of results rather than tools for decision makers. Of course this is all moot because you have to convince them google cloud wont shut down by 2023.
See Nytimes, Twitter and Spotify for examples.
Now if you’re talking about future-safety there was an argument...until a few hours ago.
Every company you named isn’t the same thing as just arguing to the powers that be - AWS is what Netflix uses. AWS has many more “referencable clients” that matter.
How is their enterprise support? The decision makers would hear everything you say and you might as well be speaking Greek.
The one CYA question they are going to ask is where does GCP fall on the Magic Quadrant? If things go wrong with GCP they will have to explain why they chose it.