Source First License 1.1: https://gitlab.futo.org/videostreaming/grayjay/-/blob/master/LICENSE.md
This is a non-open source license. They were claiming to be open source at one point, but they’ve listened to the community and stopped claiming they were open source. They are not trying to be Open Source™.
They call themselves “source first”. https://sourcefirst.com/
They’re trying to create a world where developers can make money from writing source first software, where the big tech oligarchy can’t just suck them dry.
So the first line of what you quite says you can’t.
I’m a professional developer. If I learn and use it in my job, I’m in violation of the licese.
What I mean by value is the ability to learn and use it as you wish. Without worry of if your going against a license.