Are we acknowledging a difference between the Nest device he warns about (which is sold as a surveillance device) and, say, an Amazon Echo? (Which the headline

Are we acknowledging a difference between the Nest device he warns about (which is sold as a surveillance device) and, say, an Amazon Echo? (Which the headline mentions as equally problematic, but the body of the article doesn't mention at all.) My understanding of the Echo is that it only records after hearing a trigger word.