You have a good point, let me explain a bit more how do we plan to tackle what you mentioned. As for making files public and persisting files you upload: for the beta period all files are public but once we validate the idea and improve things overall, we will also add the private storage, which will be the default option; as for storage, eventually we will give options to either use rely on us to persist the files or use persistent storage of your choice (Filecoin, Crust, Arweave) and manage it via our app UI. Regarding the copyright: it is not enforced since enforced implies taking legal or administrative actions but we can prevent a fair share of infringement in the first place by carrying the copyright attribution in the original file and all modified variants, which also makes post-enforcement actions easier. Say, you embed the image from Macula on a website and some bot scrapes it. In this case the image will still carry correct attribution. And also one thing about enforcing. Part of it requires verifying that you're the original author and for that we are developing a blockchain-based network called Anagolay, which will take care of creating digitally signed cryptographic authorship statement and will have the mechanism so that any outside observer can validate that you are indeed the author.
Hope this helps, let me know if there's anything you'd like to hear in more details.