[0] indicates they earn some 10-20$/year for vizio and 40$/month ([sic], article probably meant year) for Roku from advertising. With a lifetime of a TV at about 5 years this puts you in 100-200$ extra territory.
TFA provides the evidence that they profit more from this that from what they get from the hardware itself. So more than $400 over the tv's lifetime these days ?
[0] https://www.theverge.com/2021/11/10/22773073/vizio-acr-adver...