I tried to set up an anonymous email the other day, to see how far I could get with it. Try to sign up for just about any email requires a phone number for text verification, and when you find one that can be created without text verification, they need a secondary email address to proceed. Go to buy an off the shelf SIM card so you can get a text confirmation and what does the registration force? An email address. Even Proton wants an email address to generate one of their free emails. I genuinely do not think it would be this much of a challenge...wow!