For aws to make it available on rds Aurora, would it be safe to assume there would have to be some changes to the extension source to make it compatible with the Aurora engine? If we assume aws doesn’t want todo that, then their licensing provides some protection there.
Yeah exactly. In practice, we've inspired ourselves from the likes of Citus and others who have adopted the AGPL-3.0 license as a good compromise and have found success. It's rather comment nowadays for infra startups to use AGPL-3.0. Other noteworthy examples: MinIO, Quickwit, Lago, etc.
