Sega Channel[0]. My buddy had it around ~1995 and it was amazing. Sleeping over at his house was always unique because they would change up what games they offered each month. There are game streaming services offered now, such as Playstation Now and I think Gamefly has game streaming as well, but it amazes me that it didn't catch on sooner.

[0] https://en.wikipedia.org/wiki/Sega_Channel