What Is the Role of the Difficulty Adjustment in Preventing a “51% Attack”?

The difficulty adjustment makes a 51% attack economically infeasible by constantly scaling the computational power required to control the network. As more miners join, the difficulty rises, meaning an attacker would need to acquire and operate an immense and costly amount of hardware to command a majority of the hash rate.

This high cost, driven by the difficulty, acts as a significant economic deterrent. It ensures that the cost to attack the network far outweighs any potential reward from doing so.