Recently, one of my friends said the PCB he received is bending, so that he can't place and pick the components on exact way. Then we can't help but wonder Why cause PCB bending?
That's some serious bending you have there.
Was this shipped or stored bent ?
Is the treatment the same on both sides ? - hard to tell from the image, but is that side all solder, no mask ?
If it is all solder, then applying and thinning that would be tricky, to avoid bending.
Did maybe someone decide solder was a cheap way to increase metal thickness ? - best to avoid that, and specify thicker copper on your boards.