I get that but you cannot be selling anonymously as long as it is a way for you to make a living, fully or partially, and it is not a one time thing(like selling some used items on ebay or similar website). I cannot speak for all countries but I would say most have a law that requires you to get a sole proprietor license or incorporate as company when you are getting income from repeated transactions. Customers have various protections so they must know the identity of the seller. Not that they want to, mostly they don't, but by law they must be able to get that information, possible even receive an invoice that lists this information. Not to mention that if you are buying works for business purposes, VAT might get involved and other legal and tax complexities.
If you are making a platform you must make it universally usable. Just because one creator does not like or is missing some thing, you just cannot bend the platform to suit his needs. It just does not work like that.
Personally, I have solved the anonymity issue. It's not hard to do but it requires legal layering, which sounds way more complex than it actually is, but i don't want to get out my solution in here.