If only you or your relatives use the domain, it’s pretty easy to link all the addresses. It’s pretty fair to assume that if a search doesn’t give anything, the domain is probably personal or used by a few people at best
My point was that using a custom domain makes you less anonymous than being on the regular proton domain
If you do not use aliases, it won’t change much, but at least your identity is not directly tied to the domain name
You’re completely right. I wrote privacy instead of anonymity
If you want to protect yourself from the ads industry an like having your own domain, then it’s pretty good