If we assume that about 90% of people use Google, that’s about 4.2bn people using Google search.
200/4.2 = 48 USD per year per person.
So, 120 USD per year is more than the implicit cost of using Google, but it’s in the ballpark. I think the 48 figure would increase if you adjusted for people primarily accessing the internet through facebook, whatsapp, or youtube, which I would guess is quite common.
The world’s population is about 7.8bn, with about 60% of people being online (https://ourworldindata.org/internet).
If we assume that about 90% of people use Google, that’s about 4.2bn people using Google search.
200/4.2 = 48 USD per year per person.
So, 120 USD per year is more than the implicit cost of using Google, but it’s in the ballpark. I think the 48 figure would increase if you adjusted for people primarily accessing the internet through facebook, whatsapp, or youtube, which I would guess is quite common.