Well this is awful. My policy is if it can't agree to my terms, it is rejected. If a company is kicking up a fuss because I want to ensure my primary address isn't forever compromised by spam, and doesn't work with aliases or [duckduckgo](https://duckduckgo.com/email/) privacy relays, then said company doesn't get my attention or business. Whatever the service you're trying to obtain from them, I can almost guarantee there's a more amicable alternative.