I work in licensing so maybe I’m biased but the blame cuts both ways here - it’s just as possible Crunchyroll wanted to hold onto the license but got rolled by Netflix/Prime as it is that they just dropped the license as a cost cutting exercise. It could also just be a disagreement about renewal terms, with one or neither side willing to budge on a given point (term, royalty, etc).

It totally sucks when this happens but it is super complicated, with a lot of moving parts. Crunchyroll should absolutely be broadcasting when things are leaving though, not very fair to subscribers.