[dba-Tech] gmail & privacy

Once we sign up for GMail or Google Voice, Google does what it calls 
"content extraction" (to refine its targeted advertising) on all 
messages  from us /and to us/. That exposes everybody we communicate 
with on these services.

In the US, a Fourth Amendment legal action might put a stop to that, 
though AFAIK none has yet begun. What about other countries?

PB