[jerf]

More than 30 years ago. Believe it or not, the Intellivision has the same service, using the same basic technique in 1981:

https://www.intvprime.com/intellivision-faq/intellivision-fa...

https://www.intvfunhouse.com/mattel/playcable.php

(The Atari 2600 got a competitor but despite being the older console it was released in 1983: https://www.wired.com/story/streaming-games-actually-started... )

So, 43 years ago.