The split second that Kiddush haChodesh is declared by the Av Bes Din {Mekudosh} it will instantly be flashed on every website accross the world, & there will be absolutely no more Yom Tov Sheni anywhere in the world, with exception of Rosh haShono, when internet cannot be used to announce Chdesh Tishri.
Baissusim & hackers will both be out of business.