Earlier this year this question was asked about whether a company account is considered spam if they aren't explicitly advertising in their posts. That question was status completed as it was about a specific answer and not a broader question. Joe Strazzere asked if companies are permitted to register and provide answers, but I didn't see any real discussion besides mention of the Doxygen account on SO.
I recently came across the user Careerasaurus.com whose profile is very clearly advertising their website. However, the answers they have given so far have been generally good, one accepted with +5, and none of them have linked or advertised their site. They aren't doing anything obviously bad, but I still feel that they are using The Workplace to promote their own site, which doesn't sit well with me.
Is registration of a company account allowed? Does it fall under spam, even if they aren't doing anything overtly spammy?