Earlier quoted context omitted.
What real , non-theoretical, "would stand up in a courtroom" risk is there if the SSPL extends to cover the Linux kernel? SSPL: you have to share your source code to the Linux kernel if you sell Elasticsearch-as-a-service" GPL: you have to share your source code to the Linux kernel if you release binaries SSPL+GPL: you have to share your source code to the Linux kernel if you sell Elasticsearch-as-a-service or if you…
No offense but this advice is rather risky and legally dangerous, please don't tell people to potentially put their products in jeopardy by doing this. The correct thing to do is for MongoDB/Elastic to just clarify the wording in the license.
AGPL is okay.
I'm not hiring a lawyer when I'm selecting a few tools to benchmark. I'm not using EC until I've had the license reviewed by a lawyer. Ergo, redis or similar.