[VPenkov]

I can think of three things: serving as a guide, serving to raise awareness, and entertainment.

On the "serving as a guide" part, some people are activists and subscribe to the idea that if they are wasting a scammer's time, this means the scammer has one victim fewer.

On the raising awareness side, there are absolutely plenty of YouTube videos, but it's always good to educate people before they become targets. The psychological and financial impact of getting scammed can be devastating. Raised awareness could also prompt the authorities to crack down on scam centers.

On the entertainment side - some people just get a kick out of it.

Additionally, this particular article breaks down the various tactics used and teaches the reader to identify them.