It is relevant because any online business necessarily has a lot of information about its customers. Spamming is both illegal and immoral (free riding on the commons), so I would choose not to give my business/info to people with a known history of such activity.
Also, spamming may be against many company's TOS but that does not make it illegal.
Go read the CAN-SPAM Act.
If someone is writing a program to send out unsolicited e-mails on behalf of other parties, it's pretty unlikely that they're doing the due diligence. I don't know what happened but I think it's funny that all the responses are "Aaron Greenspan is a whiny loser".
Also, I don't read any company's TOS when deciding whether to do business with them. Do you? I go by their reputation. If a company has a bad reputation then it makes me less likely to do business with them.
Except if I read a bad review about a company from someone who has a record of bad experiences with companies, I do not take that person's review into account and discard it as an outlier. Aaron Greenspan has a pretty solid history of being that guy who has a problem with almost everyone of stature that he has come to know.