In my experience (ex-Googler here), recruiters tend to be contractors who work off a script and get bonuses proportionate to how many people end up in the hiring pipeline. There are checks and balances to prevent outright spam, but the motivations are aligned in such a way that a pretty wide net is cast.

Also, until you have interviewed, all positions are "unspecified". Many positions need to be filled and they don't pick one for you until they know what you can do.

Geography is not really considered to be an issue. Once SRE finds someone they really want they will help with relocation.