Here’s an interesting parallel; how much say does any child have in the cell phone plan that a family uses? Probably damn close to 0. That’s a decision that the parents make on their own, and dictate the rules of usage to their children. I suspect that internet service will remain that way as well.
fortnite v-bucks default gift for birthdays, displacing the movie gift cards
racking up hundreds of dollars worth of v-bucks per year
getting family to buy a Samsumg S10+ so they can reap the associated "skin" to their Fortnite account
graphics cards upgrades
(expensive) gaming mice and other gear pushed by youtubers
general merch like toys
Now these services advertise to adults with children, such as being able to call your kids whenever with the unlimited cell phone plan, but that’s still advertising to the adult, not the child.