Hairline crack

I have the iPad 12.9 and my first iPad after 3 months of use it gotten a hairline crack they replaced the iPad 6 months later if noticed on the second one a hairline crack again what is wrong with theses iPads ,the glass manufacturer not the same are they going cheaper paying 21 000 rand for iPad Pro 12.9 and screen cracks appear for normal drawings use note with the iPad pencil .

What is going on if this keeps happening I’m going with Samsung , to have this sorted out is Such a mission I’m in total shock Apple is suppose to be the best and getting the best means absolutely nothing .

It’s a 2cm hairline crack on bottom of the screen where the 3 charging points are

First iPad cracked ********** 7 Second iPad now currently ********** 8 Spoken to thanos sotirou