Mastodawn

"The blood was only ever a means to an end," the vampire confessed in the interview.

"To what end?" the reporter asked.

"Blood carries vigor, life force, vital energy. That's what we feed on."

"So how do you get it, if not through blood?"

"These days, we make doom scrolling apps to drain it."

There was one story set in the White Wolf's "World Of Darkness" RPG, "Changeling: The Dreaming". that used this exact mechanic.

Only difference was that the story was set in a call centre, but the intent was the same.