I think it depends on whether it’s active or passive. Active - e.g. a laser that damages a camera sensor, then yes, your device is actively damaging someone else’s camera - deliberate property damage. Passive - e.g. reflective strips so the exposure is bad, a pattern that is hard to focus on or similar- that’s fine - camera owner is making a decision to expose their gear to the environment. Even if, say, it’s a changing pattern that deceives the autofocus into working constantly (no, I don’t know exactly how that would work, but it’s the best I can think of at short notice) so it wears out faster.

Congratulations!

Garbage In, Garbage Out. Not enough info, so can’t provide meaningful response, I guess, in this case. That said - I wouldn’t be happy, done know why they would be.