But I also read that they don't get along with other octopuses most of the time. And in this article too they fight over territory. But Humans do that too, and we're social.
If forming social relations are evolutionary advantages, then I wonder would perhaps Octopuses start developing more social tendencies as a means of adapting to these new environmental changes. As noted in the article, the areas contained surplus food. Which is also interesting, but maybe this is just a local phenomenon, because there were many headlines in recent years about overfishing.