All of these are assumptions (some cynical). But what is the actual reason Google is experimenting with projects in this manner? I wonder if Google is using their data-based approach here.
For someone like Google, there's no point in pursuing a product line they're not dominant in. It's all just speculation, but either google is just godawful at managing acquisitions or side projects, or they don't bother to pursue product lines where its profitable but not overwhelmingly so