I hear this a lot but I'm still not convinced it's true. Iirc Redis still takes 20 minutes to provision on both Azure and AWS (unless they optimized it in the last couple years) and doesn't provide much value. The creator of the software should be in a much better position to offer a rich product experience than a 3rd party can.

Elastic is even more interesting here. There are plenty of anecdotes about Elastic purchasing being complicated and confusing. In addition, for the first few years of existence, AWS Elastic was missing some basic features (afaik you couldn't scale your cluster or something similar). In fact, AWS is now maintaining their own fork of Elasticsearch.