I have some theories on this.
India isn’t much of a market for internet commerce, being largely a third world country full of poor people, many still without electricity.
The US is recognized as rich and prosperous, we supposedly have money to spare, and rubes abound.
Indian spammers don’t take time to recognize (or give a crap about) the format here, only that its an internet site they can access.
Its easy and FREE to advertise here.
I think we all can recognize how pathetic and parasitic these clowns are, lets unite to show them no quarter