Whatever the reason -- I'm glad to hear this news. After years of deliveries from them, Fed Ex suddenly couldn't find my house anymore. Customer service was useless. Even complained to Amazon about them.
Amazon now has its own delivery service if what I order is available from the local distribution center and it is developing drones and other delivery services of its own. Much of the time if an outside delivery service is needed, I get my stuff through USPS. My mailman knows where I live.