I would add EventstoreDB (now KurrentDB) and NATS to the list of questionable service providers. The former has already relicensed it's service, and the latter had also intended to do so, they just chickened out after seeing the reactions and resistence from their user base. It's really become a business strategy at this point to pull the rug below the users.
I thought NATS was a project under the CNCF, with the trademarks being transferred to the Linux Foundation, which is why they couldn't relicense NATS, and why they can't relicense it in the future.
