You are fine in this case, you can include as part of a Package you sell on the asset store, custom actions required for your feature to work, you have added value to this, it's used as a building block and not as what you are actually selling. That's fine and we do encourage this.
Basically, it's totally free for you to mess up with, but you'll never own it per say ( because then theoretically one could sew genuine authors of these actions to remove them from public access, and that's not acceptable).
I guess, I need to put a proper LGPL and MIT license mention within the Ecosystem browser. I'll will be in the next update.