What does "spam" mean here?

When the term was coined in Usenet’s news.admin.net-abuse.*, it strictly referred to posting the same content in zillions of threads. However, the “flag” option on this forum that mentions spam talks about it being an off-topic advertisement.

I ask because somebody just posted the same link to some starter project they wrote in 20+ threads (probably everything that came up in a search for “sqlite”), some of which were quite dormant. Technically speaking, I guess it’s not completely off-topic, but is this sort of thing condoned here? If not, how are ordinary mortals supposed to react?