"Yes, it just means that we're doing our best in singing so our voice cracked."

Yet people still believe this means the singer isn't talented 💀. Voice cracks are normal, people.
Also, lipsync sometimes is necessary. If u have lots of schedules where you have to sing, it can be harmful. I mean, if you talk a lot of scream more than you're used to, it already hurts, so nope, better take care of your own health.

Edit: With this I hope no one thinks I'm dragging them or smth because nope. I believe one day they'll lipsync, they're getting more and more attention so it wouldn't be good for them to live sing always, they're too young.