Depending on how it is used a second anonymous account isn't illegal if it is not used to milk the system.
I recently created a separate account just for my Actifit App alone since I am a fan of the App and also challenging a friend daily we thought its best to create a separate account for it, perhaps that might end up being my anonymous account 😉
But I think I understand your point, if multiple accounts are created for the wrong reason it won't be too long will the person is identified for wrong doing on the chain.