>>713953102
That's because octopi have no reason to socialize. They're solitary predatory animals and also on the complete other side of the animalian evolutionary tree from the other intelligent lifeforms. Remember, they're mollusks. Octopi are on a "less evolved" branch of the evolutionary tree than fish. They're the closest thing on Earth to an alien intelligence.
Socializing isn't necessarily a measure of intelligence either since even relatively dumb animals like flamingos socialize. When it comes to raw intelligence, octopi absolutely BTFO elephants. The elephants have way longer lives than octopi, though, and socially teach other elephants. Meanwhile octopi die in 5 years.
Let's not forget that octopi can and do form symbiotic relationships with other animals. They've been known to hunt with fish, and even get frustrated when the fish they hunt with takes too much food and end up PUNCHING THE FISH. Octopi are basically aggressive autists that kill themselves young while elephants are dumb normies that live until 80 and accrue some level of wisdom.