No! They all came to exploit the wealth of India. For a thousand years India was the richest country in the world with gold, diamonds, spices and most fertile land in the world.
Even now with 1500+ million people India can export surplus food.
To call this "exploitation" is intellectually lazy. It was a trade and cultural exchange. They took raw materials and used their superior knowhow to convert them into useful goods that could be sold around the known world. In exchange, they enriched India culturally and socially by introducing new knowledge of craftsmanship and classical wisdom (Aryans), architecture and sculpture (Greeks, who influenced the Asoka-era), cuisine, dress, language enrichment -Urdu/Hindi has a lot of borrowed Persian words, and grand architecture - (Mongols, Arabs, Persians), and finally the key elements of Westernization and infrastructure, thanks to the Europeans, most notably the British. India has been infinitely enriched as a result of these invasions.