For those arguing it is still open source, Liquibase says it is not.
"Is FSL an open source license?
No."
https://www.liquibase.com/blog/liquibase-community-for-the-f...
"Is FSL an open source license?
No."
https://www.liquibase.com/blog/liquibase-community-for-the-f...
The capitalised term indicates it's a license approved by the Open Source Initiative, which is commonly used as the basis of "actual open source"
(I do agree that this gets a little murky, especially with folks who don't understand the nuance, which is a large percentage of folks talking about this)
I do agree that not calling something even "open source" if it's under a license like the FSL is best