There's a lot of brain drain in Kerala with people getting educated and leaving. Those that leave do, however, send money back to their families and I know many who return to live in India after 5-10 years. This was the case a decade or two ago and I'm not sure if it's still the case.
I had many aunts or uncles who would leave their family behind in India and work in the middle east for many years before returning to India. This practice helped them shore up savings and build houses.
Remittanced only contribute to 15% of GDSP. 65% is from tertiary sectors of IT, Healthcare and Tourism. Kerala gets substantial investments from private companies instead as opposed to large corporations in Gujarat for example. Investments in Kerala rarely grab news headlines as it’s mostly private investments.
The guys I knew from Guatemala doing yardwork/construction in the US had the same setup. They’d sleep in shifts in bunk beds and then go home to their new ranch after a few years.
I had many aunts or uncles who would leave their family behind in India and work in the middle east for many years before returning to India. This practice helped them shore up savings and build houses.