I suspect it's because the international market for print manga (the primary cash cow) is rather anemic, particularly compared to anime.
Publishers see the loss as minimal and creators see piracy as free advertising to drum up enthusiasm for anime adaptations, which actually do drum up decent profits internationally (the committee keeps the streaming licensing fees, not the animation studio).
Publishers definitely don't see it that way; that's mostly an extension of a myth in order to justify the piracy.
Most manga publishers will see relatively little revenue from international anime releases. Even for domestic anime releases of the vast majority of titles, the manga publisher is only a small part of the anime production committee, and the hope is mostly that popularity of the anime can lead to increased sales of the manga, merchandise, or other events. So when the anime is released internationally, they get an even smaller cut of that because the international licensee also has to take their profit.
But other than mega-hit titles where an international anime release may also lead to significant international manga sales, the popularity of an anime adaptation overseas is practically irrelevant to the original manga publisher.
Publishers see the loss as minimal and creators see piracy as free advertising to drum up enthusiasm for anime adaptations, which actually do drum up decent profits internationally (the committee keeps the streaming licensing fees, not the animation studio).