Well, some
extremely bad publicity
will result if Amazon complies with it's T&C's and releases data recorded in response to a search warrant, because
if a legally valid warrant is served, and Amazon can't get it quashed, they will have to release data.
We then WILL be in the position of any Echo owner simply not knowing what has been recorded by Echo, transmitted and stored, or for how long, and under what circumstances a search warrant might be honoured.
For a start, anyone called, or with a partner called, Alex might want to move it out of the bedroom ...
"Oooh, Alex .... aaah".