The Bitcoin block mining difficulty is adjusted every 2,016 blocks (approximately 2 weeks) to maintain the rate of coin issuance and block confirmation times as the network grows or contracts.

A high difficulty means that it will take more computing power to mine the same number of blocks, making the network more secure against attacks.

It prevents #Bitcoin being mined faster and thus making it predictable and it in a way enforces there can’t be more #BTC than it should.

It’s probably only thing that can’t be created faster/cheaper when you throw additional money into mining - hashrate goes up, in 14 days max difficulty goes up as well.