So I need to explain to someone who doesn't think that it matters that it matters to me?
The fact that a post is about something else has never prevented people who take the time to comment on HN (an unpaid endeavor) from voicing an opinion on something related or ironic in some way.
> nor does an employee of a company have to use their services (especially if they spun up their domain, website, whathaveyou before working for the company) for any sort of personal project.
You are right it is not codified into some law. But as a general rule it makes more practical sense for an employee to use the employers products especially if they are posting a comment on a blog about another service that the employer offers where it's easy to see (such as I did) that they are not using the employers free primarily product that they are known for.
Why should the employer not expect that their employees use their free product (which jgrahamc does use of course for his personal domain JGC.ORG ..).