Octopodes have a different nervous system than vertebrates. We have a brain that does almost all of the "thinking" while the rest of the nervous system is either sending or receiving signals (with some "thinking" done below the brain like in the spine).
Octopuses have a brain, but much of the "thinking" is done by nerve clusters in each tenticle.
While grasping on object for humans requires signals going from hand to brain and back, for octopi, a lot of the signals can literally just stay in the tentacle.
It makes sense in that context that they would learn tasks in specific tentacles.
I think over the past few decades, immigration enforcement has been a benefit to these people.
The government cracks down on illegal immigration publicly, which keeps an environment of fear among a community that knows they can't rely on the government to ensure fair wages or safe working conditions. The people hiring them then know they can exploit immigrants without any scrutiny.
In the past, maybe immigration enforcement loss them 5% of their labor, but saved them 20% in wages (completely made up numbers). Maybe they expected the same now?