Now, about the article, and especially about this:
> T'aarof also governs the rules of hospitality: a host is obliged to offer anything a guest might want, and a guest is equally obliged to refuse it. This ritual may repeat itself several times (3 times)
the same "3-times" rule was also valid (and in some places it still is) in rural Romania until not that long ago. More exactly, if you had been invited to their table "only" once or twice by somebody else you had to say "no", only the third time were you allowed to say "yes" (if you really wanted to). It also created lots of awkward social situations after Communism fell and foreigners (mostly Westerners) first came to Romania. Lots of them would accept table invitations which were not really meant to be accepted on the first go.