Am I supposed to have sympathy for people who bought a home snooping device now realizing they're going to be snooped on?
Yes. If, as a culture, we don’t stand up for consumer rights when a seller mistreats others, no one will stand up for us either.
There's only so much sympathy and support and standing up for others that I can fit into any given day and I'd rather give it to people who weren't warned about the dangers beforehand.