This is based on the assumption that Azure has modern tech, hires well, DR, and better resiliency than LinkedIn's "cloud" for LinkedIn's needs. There's a bit of a problem around incentives here, where Azure is built to sell to Azure's customer base, whereas LinkedIn has evolved their own stack over the years.

The questions become:

1. Does it make sense to dump our special features in the stack, or move them to a higher level in the stack? 2. Does Azure have comparable capabilities for the LinkedIn stack? 3. Is LinkedIn worth it to Azure to sell to?

---

Often times, "at scale", you can support custom solutions outside of cloud providers that are purpose-built, and often times more resilient and efficient than the cloud providers.

AWS has taken a very interesting approach of building an incredibly wide set of solutions to support every customer under the sun, and their approach to being "customer obsessed" leads to them building super niche solutions if the deal is worth it.

I'm not sure how Google and Azure handle these engagements.