Your suggestion that "anything popular cannot be morally wrong" is proposterous. It feels like you're trying to bait people into arguing with you in a way I associate with bot spam.
But on the off change you're a real person - I will politely say - just because something is useful and popular doesn't meant it doesn't have negative externalities and doesn't mean people shouldn't fight to make it better.
Improving emissions standards is important even though lots of people drive cars. The same can absolutely be true of AI.