I have hairline crack on my surface laptop 3 13inch black (aluminium cover)
And I had found out it cost $700AUD to repair.
About over 2 years ago, I bought a surface laptop 3. For the last 2 years I have treated it with care making sure the screen would not crack or break (not the keys as much since a small fidget could detach them). Yet, I have found out, while starting to clean, a hairline crack had appeared on my laptop screen. I have not once dropped this laptop in the last year, but 4 months after my warranty had expired, only then did it appear.
And I use this for school.