I completely disagree with that prediction. When comparing the operating costs of a first-party vs third-party managed Redis service, cloud vendors have substantially lower operating costs for their underlying infrastructure (servers / data centers) than Redis Ltd. This means the cloud vendors can still offer a competitively-priced product, despite having to pay Redis Ltd for licensing fees.

Cloud vendors can also offer better inter-op between their managed Redis product and their other managed services, availability of managed Redis in every single region the cloud vendor offers, lower latency, etc. The managed offering directly from Redis Ltd can't compete on those qualities.

Additionally, Redis Ltd is motivated to not massively jack up fees on Azure, because in that situation Azure could switch to ValKey (or any other fork, or an in-house compatible re-write -- which they already have one of) and tell Redis Ltd to pound sand, like what AWS and GCP did.

Market forces are what makes Redis Ltd have fair prices, and this inherently means there's no monopoly.