EDIT: added more context below. I'm a freelance video editor using Pika 2.0 for client projects — mainly short social media clips and ad concepts. Need to understand:
Tbh the copyright question is the elephant in the room for all AI video platforms. The Copyright Office's guidance (post-Zarya of the Dawn) suggests that purely AI-generated content without sufficient human creative input isn't copyrightable. For video, the question is whether your prompting, editing, sequencing, and post-production constitute enough human authorship honestly.
Practical advice for commercial users: (1) add substantial human creative elements in post-production, (2) keep records of your creative process and decision-making, (3) consider the AI output as raw material rather than finished work, (4) check client contracts — some brands are starting to require disclosure of AI-generated content and may have restrictions.