D-brand or Zack or whoever own the photos and editing work of those. Casetify stole their photos (i.e. they scanned them and took their photos of their website).

If you take a photo of the Washington monument you own that photo. If someone slaps that photo on a case without your permission, they are stealing your work. You do not need to own the Washington monument, nor do you own anyone else's photo of the Washington monument and you sure as hell do not own the idea of taking a picture of that building. But that photo they used, that is your work.

If you watch the video, they pretty much say the same. Casetify can make the exact same type of case, but they must use their own photos of the inside.

You clearly are missing the point. Casetify is being sued because they use the same assets materials which JRE and DBrand use for their cases.

The Easter Eggs served as a unique identifier proof that those are the same assets being used.

In other words, Casetify didn't use their materials but instead took from JRE and DBrand and begin selling them en masse for profits. That's why they are being sued.

You didn’t watch the video then. JRE says it would be one thing if casetify made their own scans of the devices, and would welcome the competition. However, casetify clearly just stole the work JRE and dbrand did, and JRE showed the Easter eggs he and dbrand threw in clearly present on the casetify products. This is not simple competition, it’s casetify needs to do their own work tearing down devices and scanning them instead of stealing the work from others. The Easter eggs are proof that casetify stole the work and didn’t simply replicate it.