They discontinue stuff even if it makes money because it's a blip compared to ad revenue. Someone looks at a product like Chromecast Audio and decides it's not

They discontinue stuff even if it makes money because it's a blip compared to ad revenue. Someone looks at a product like Chromecast Audio and decides it's not really helping ads so there's no point in spending money on maintenance for it, especially with the previously mentioned stuff that Google's corporate culture does not reward sustaining/maintenance/support work. If a money-losing product is have a positive effect on ads somehow it probably gets to live.