Moving several videos at once from one playlist to another is paywalled (prompt for Patreon subscription). Lame.

A trial period, or a limit on the number of selected videos would have been better. And make that clear on the add-on description. Otherwise it just upsets people.

I understand it takes some work to maintain that, but give something useful to people first. No one cares about groups.

EDIT to answer the developer: Such nonsense! If so many users care about groups, why don't you make that only a premium feature? I would have gladly paid for this if it had been made in a way that made more sense and not so overtly money grabbing. You just wasted my time.

EDIT 2: Sir, I do appreciate your work: it's a great idea, you made it work, and you keep maintaining it. Bravo. I'm a developer myself, so I know it takes time, skill, and dedication. My point, like most bad reviews you got, is that most features are paywalled. And that's not mentioned in the plugin description at all. It's very misleading, and it's done on purpose. We installed the add-on expecting all those features would be free. That was our EXPECTATION. Discovering we have to pay, we felt tricked.

Please just be clear in the add-on description about which features are free, and which are premium. That's all. No one is arguing with you that your work deserves to be paid. We are upset just because we felt tricked. That's not good business practice. I'm taking the time to write that so you can do better in the future. Best of luck to you. Don't hate me too much :)