As a result, some ISPs apparently block the domain. Why is it listed? I have no idea. There are no ads, there is no user content, and I've never sent any email from the domain. I've tried contacting spamhaus, but they instantly closed the ticket with a nonsensical response to "contact my IT department" and then blocked further communication. (Oddly enough, my personal blog does not have an IT department.)
Just like it's slowly become quasi-impossible for an individual to host their own email, I fear the same may happen with independent websites.