The American porn industry is as big as Hollywood. This is a big billions of dollars market. And the US porn industry provides 90% of international porn. So Trump and his GOP wants to kill the one last American industry where the US is world market leader by far.

And I can easily see this industry moving to countries where actors are cheaper and less protected from abuse, diseases, and whatever else happening in this industry.

While this will make some religious fundamentalists in the US feel superior and give them a sense of a perceived moral high ground, it will actually hurt the most vulnerable people in the chain the most. It will not reduce the amount of porn made, it will just make it much, much worse for those involved.