Unfortunately, they don't need to. Besides the troughs of data from third-party sources, the likelihood that an Echo user is also an Amazon shopper is probably

Unfortunately, they don't need to. Besides the troughs of data from third-party sources, the likelihood that an Echo user is also an Amazon shopper is probably approaching 100%. They get so many good ad signals just from retail, books, Prime Video, etc. that they really don't even need to actively monitor you with a mic or camera...