This isn't true. Modules are free (unless you're a hosting competitor) so there is no licensing revenue there. They might be charging a handful of enterprise customers for special module support, but that isn't their main revenue stream. Their revenue is from Redis Enterprise which is a Redis hosting solution (managed cloud, unmanaged cloud or on-prem). Redis Enterprise is entirely closed-source, but it's an infrastructure management system and not a data store (it isn't Redis).

Redis Labs only supports Redis Enterprise. They're not in the business of offering support for Redis.

No, the difference is that Elastic is a massive $15 billion company which needs more revenue to survive, while Redis is still largely run by one person.

This isn't true. Salvatore retired earlier this year. Redis is run, more or less, by Redis Labs which is valued at $1 billion.

While it is true that Salvatore retired last year, Redis is still FOSS under the BSD license, and it has a new governance team. Redis Labs is in the drivers seat with 3 of the 5 members, including 2 Project Leads. But there are members from Alibaba and AWS https://redis.io/topics/governance

If Redis Labs were to do something stupid with the Redis OSS license, Alibaba and AWS would fork it faster than you can HyperLogLog.

Too help clear up confusion between Redis & Redis Labs, you can read about the various licenses here: https://redislabs.com/legal/licenses/