Their efforts to copy the Her character mannerisms is still annoying. They were aiming for the Her-like personality. But it's a stretch to say it's a copy of Johansson's voice. The haze in her real voice isn't there in GPT. Maybe they decided to pull the voice because it's not good publicity to have Scarlett Johansson pissed off with you.
Nevertheless these tech companies should hire professional film writers and artists to help with difficult concepts such as original ideas and not copying other's work.