u/charlino5

I'm currently using a custom domain for all my email aliases, but am wondering if it would be more private to use one of the domains available through Proton Pass or SimpleLogin. I understand the major benefit of a custom domain is that the aliases can travel with you if you switch email providers. But other than that, is there a benefit to one method over the other? Is there a preference of using a Proton Pass domain or a SimpleLogin domain? I noticed Proton Pass and SimpleLogin domains use CloudFlare for DNS, which seems like an odd choice for Proton. Does that pose any issues for those using those domains?