Because it's a drug that gives you a feeling. Some people enjoy the feeling that smoking gives them, the addiction slowly follows after.
The same works for just about any drug. I can assure you that heroin and crack addicts didn't suddenly decide they wanted to be addicted to those drugs. Curiosity gets the best of people sometimes.
Not OP but in my personal experience I've talked to countless people that had no idea watching YouTube without ads is possible (without paying) and their minds were blown. With Google calling out attention to it like this, I'm sure many will get curious. Most people don't use their electronics beyond basic functionality..
And tbh you're gonna be hard pressed to get real data of how many ppl are suddenly finding out about it.