James Serra lays out some of the benefits and drawbacks of using multiple cloud providers:
A discussion I have seen many companies have is if they should be single-cloud (using only one cloud company) or multi-cloud (using more than one cloud company). The three major Cloud Service Providers (CSPs) that companies use for nearly all use cases are Microsoft Azure, Amazon Web Services (AWS), and Google Cloud Platform (GCP).
Without spoiling it too much, James is not really sold on the idea.