It this case, this is more like a foster parent; Oya started as a part-time open source project, then Tooploox sponsored further development after having used it internally.
It was created as an independent open source project, then used internally @ Tooploox, then development got sponsored by Tooploox so it does make sense from our (very subjective) pov.
But I agree AFTER it got moved to Tooploox Github it looks kinda self-serving.
Not everybody uses JavaScript. There are many language-specific task runners (e.g. Rake, Mage etc.). Oya is aiming to be language agnostic and lightweight (not require a ton of dependencies).