This is obviously frustrating, but do not focus on it. They were wrong and lazy to blatantly copy, but would it really make a difference if they spent an extra

This is obviously frustrating, but do not focus on it. They were wrong and lazy to blatantly copy, but would it really make a difference if they spent an extra couple hours with a few copy/css changes to make it look more unique? Unfortunately, the market does not care about who had what first. This is a validation for you. Frustrating validation. You likely do not have the resources to fight them for anything meaningful. Stay focused on your customers.