I've never heard of "Source First License 1.1". Is this license free & open source?

• https://gitlab.futo.org/videostreaming/grayjay/-/blob/master/LICENSE.md

Comments about it:

• https://news.ycombinator.com/item?id=41000366

GNU.org says non-free:

• https://www.gnu.org/licenses/license-list.html#NonFreeSoftwareLicenses

Open Source Initiative: no results found, for neither "source first license" nor "futo":

• https://opensource.org/licenses?ls=source%20first%20license

This thread: Source First License not open, not submitted to OSI, anything with this license will not be hosted by F-Droid because they don't consider it FOSS:

• https://github.com/spdx/license-list-XML/issues/2679