I think affiliate marketing is the easiest way to make money online. unless like all other business it requires time and consistency but its the best way to get freedom while making money online.
For someone yes, it is an easiest way to earn, but only if you know, what to do, and how.
Everything needs a patience, learning a lot, and time.
There is no magic button to earn just like that in marketing, especially when you are newbie...
Easiest - No. But a legit and good way to earn money. If you have patience and work according to strategy and planning then you ca surely get good results.