That's not source-available, that's still open-source. Quoting Wikipedia:

> Source-available software is software released through a source code distribution model that includes arrangements where the source can be viewed, and in some cases modified, but without necessarily meeting the criteria to be called open-source.

https://en.wikipedia.org/wiki/Source-available_software

> Open-source software (OSS) is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose. Open-source software may be developed in a collaborative, public manner.

https://en.wikipedia.org/wiki/Open-source_software

And as said here, SQLite was operating like this forever.