Here it write that the largest possible target value (max target value) is:
0x00000000FFFF0000000000000000000000000000000000000000000000000000
Bitcoin wiki also mentions the same value as the highest possible target.
It is target value in genesis block and first 2016 blocks.
I wonder why this is the largest (max) target value? Is that one of the consensus rules? Thus, the target value can increase/decrease depending on the current hash rate but must be less than a given value?