I'm pretty sure as long as the creator states in their mod license/you get confirmation from the mod page stating it's allowed to be in modpacks/creator themselves tells you if you ask them, then it's ok, then you can add it to the modpack. I'm pretty sure it's that easy.
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'Niche Community Content Finder' for fun and support of creators. I just swim through my 'Experimentation Pond' of content that intrigues me or really needs a bit of acknowledgement or bug fix testing/reporting. I also make modpacks/maps
Creator/Maintainer of Fabric, Rift & Tesla Mod Discussion Threads/Niche Mod Youtuber.