Earlier quoted context omitted.
If you have an enemy that's committed and skilled enough to break into your house undetected while you're not there just to listen in on you, I feel like they could just plant a bug or something.
in theory a software rooted echo would be superior to a bug; fairly high quality positioning by the victim which ensures good quality recordings and a fair amount of plausible deniability opportunities by the attacker. if discovery was considered inevitable software can be tripped into wiping data or reverting states.
They could also put a bug in the echo dot. Free power supply!