Indeed - in fact Microsoft recently tried to buy Pinterest just to get a large company that they can move from AWS to Azure:

> The deal, which would have been Microsoft’s largest acquisition to date, confirms that the tech giant is continuing to pursue an acquisition strategy aimed at amassing a portfolio of active online communities that could run on top of its Azure cloud computing platform. Pinterest - which boasts more than 320 million active users - currently relies on Amazon Web Services (AWS) as its infrastructure provider.

source: https://www.forbes.com/sites/carlypage/2021/02/11/microsoft-...