What is the main privacy concern associated with this handheld telescope?

The primary concern with this compact telescope is its potential misuse for surveillance of people when they are most vulnerable. Due to its small size, the device can be easily concealed and used discreetly to observe others without their knowledge or consent. This raises significant privacy issues, as the product's portability and concealability make it ideal for inappropriate voyeuristic activities. The clip highlights how otherwise useful technology can become problematic when exploited for invading others' privacy, suggesting users should be mindful of legal and ethical implications when using such devices.