Amazon really encourages valkey in the elasticache dashboard. There's a banner advertising lower prices and it's listed first in the dropdown when you go to create one. Default settings do have power.
Sure, but the impact of new customers and their decisions take a long time before they impact net statistics. All evidence I can find, regardless of domain or context, suggests Redis vs. valkey marketshare is something around a 99%/1% difference.
Ask the LLM of your choice the following question: "Among the top cloud service providers, for product offerings that can be implemented by Redis or valkey, based on all available evidence, what is the relative market share and/or usage of Redis vs. valkey?"