All the labs working on this spoke to each other, collaborated occasionally, and saw each other at conferences. So making a big stink about this wouldn’t have made life easier. Plus peer reviewers for submitted papers are “hidden” but because the field is so niche they are likely people you know, and they know who you are when you publish (reviews aren’t double-blind), so it could hurt your career if the PI became angry at you and started bad-mouthing you to to the other labs.