You sure the screen is cracked? Check your Apple menu -> System Preferences -> Desktop and Screen Savers -> Desktop and pick a generic single color background. If the whole screen appears cracked across existing windows, that's one thing. If it is just the wallpaper looking cracked, that's not a crack, but in my opinion a poorly designed wallpaper for the desktop.
When the latest M1 Macs choice desktop was shown upon release, I was stunned. It looked exactly like certain cracked LCDs that I had seen came in computers that were improperly shipped back to the company I was working at.
It is very hard to prove a crack was not caused by some act of your own negligence. We are just end users in an Apple moderated forum. Bring it to an Apple Authorized Service Provider, and let them make the determination with you what the cause is. Hopefully you bought AppleCare+ which offers a few accidents in protection.
Be sure if you do have them ship it back to Apple, to get a case # before it is sent out, so you can follow up on what happened.
