I looked in the GitHub issues and there's a closed issue for F-droid inclusion. The author states that F-droid "Doesn't meet their requirements" but doesn't elaborate. I wonder what F-droid is missing that they need so much?
F-Droid only packages open-source software and rebuilds it from source, while installing from Accrescent would move all trust to the developer, even if the license changes to proprietary.
I understand that the author trusts itself more than F-Droid, but as a user the opposite seems more relevant.