I use Digital Ocean, GCP and AWS. I think each has a little bit of a different use case and as a dev we should be up for each of them. I can run a k8s cluster on digital ocean for like $20-30 a month and spin up multiple services for experiments.
However, there is not a great S3, Cloudfront equivalent on DO so I need AWS.
For ML/AI stuff, you need Google. There are probably a ton of these little variations.