$702 more is relative and tells nothing without the basis. It's 61% increase in 5 years.
So in real terms it's up 26%. Which of course is to be expected, people have a set amount they are willing to spend on entertainment, in the past it was cable -- in 2015 the average US cable TV subscription was about $100, that's about $140 today in real terms, or $1700 a year. Seems that streamers have a long way to go before they extract all that money.
I subscribe to YouTube and my partner subscribes to Prime. We have a joint cable-like tv package too, and one of us pays for Disney Plus. In the past we’d have been consolidated into one cable subscription consumption, but now we appear in the stats as lots of distinct consumptions.
I think all-in, streamers plus other subscription based entertainment services are nearer to the $140 figure per household than the individual figures describe.