M1 Macbook Pro 16 inch internal screen broken for no reason

Check Your Service and Support Coverage - Apple Support

Whether your MacBook is still under warranty or not, you can get a service and repair estimate from Apple.

You can make a Genius Bar appointment for hardware/software service and support using this link:

Contact Apple for support and service - Apple Support

Get your Mac repaired and how much will it cost:

Mac Repair & Service - Apple Support

Complex Electro-mechanical devices fail at random, arbitrary, and capricious times.

The most frequent reason for most failures is 'just because'.

Your specific failure is most likely caused by an advanced scientific principle called ...

... 'bad luck'.

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If you want a really substantial lesson how this this works (or more precisely how this stops working) own an older used automobile.