In the digital world, randomized experiments can be cheap and fast. You don’t need to recruit and pay participants. Instead, you can write a line of code to randomly assign them to a group. You don’t need users to fill out surveys. Instead, you can measure mouse movements and clicks. You don’t need to hand-code and analyze the responses. You can build a program to automatically do that for you. You don’t have to contact anybody. You don’t even have to tell users they are part of an experiment.
