[mindslight]

Except the chance of a human seeing those messages is still constrained. I don't think your 'average' person is creeped out by a computer analyzing their messages. To the extent some might be, they have so little digital autonomy (gmail etc) that the only way they can change that is to avoid electronic communication for the things they'd like to keep private. And the majority are clearly not doing that for the bulk of their communication.