What will they do with it and why do they want it so badly?
Add it to Google cloud to compete with Microsoft. Microsoft does have really compelling offering from management PoV. They have Identity Provider, endpoint protection, cloud policy scanning, whole mess of 365 stuff along side their cloud. GCP is probably losing deals to that story. As Azure Ops person, it’s poorly integrated story sometimes but good story is good story.
GCP doesn't lose deals to Microsoft because of a lack of security offerings. They lose because Microsoft has deep, rich ties to most big corps in the US and Europe.
When I worked for a software company that could be deployed on every cloud (and across multiple for the same client), I was shocked at the demand for Azure, even back when they were way behind AWS and GCP in terms of offerings.