It's crazy to see so many brands put out products in a never before thought of market segment solely based on the rumor that Apple is planning on creating a product in that market...
Yes, Apple is literally the only reason Google is doing this. 100% the only reason. No other reason at all.
It is an empirical fact that Apple invented the idea of such a device, just like they invented the MP3 player, tablet, laptop, desktop, television, set top box, and any other product they make. The only reason any other manufacturer makes any of those devices is because Apple makes them.