Google will NEVER harm itself by supporting fake data feeds. The only reason G exists at all is because they can exploit the data they harvest from you. If you're given the power to poison that data Google implodes and the whole Android platform becomes extremely unattractive to other massive companies that live off of leeching your private data one way or another.
Yes, an OS built first & foremost for its users/customers would have LOTS of options like that. A mobile web browser built the same would support plugins from day 1. Etc. Etc.
But Android, Chrome, Windows 10+, iOS are ABSOLUTELY not built for their users. They're built as vehicles that enable other services from a slew of big names and it's essential for these platforms to ensure users are NOT given the power to fight against those services.