You listed their good points, the other poster listed some counterpoints. The one post is no less relevant than the other in a discussion about possible DNS hosting options IMO.
Though I think the post would benefit from some citations to improve its relevance/usefulness otherwise it is little better than personal opinion/conjecture.
Unless you are specifically questioning the relevance of hosting spammers, on which case: If that is true (again, some examples would be helpful here) and you intend to host your own mail servers via their services not just the MX records pointing to other mail services, you could find yourself blocked by association at some point. False positives are a big problem in this area and can be much admin to clear up.
Though I think the post would benefit from some citations to improve its relevance/usefulness otherwise it is little better than personal opinion/conjecture.
Unless you are specifically questioning the relevance of hosting spammers, on which case: If that is true (again, some examples would be helpful here) and you intend to host your own mail servers via their services not just the MX records pointing to other mail services, you could find yourself blocked by association at some point. False positives are a big problem in this area and can be much admin to clear up.