…exactly

would be a significant deterrence for anyone who can still think rationally

So not for serious addicts.

heres one product https://www.birdshades.com/

I assume the others use relatively similar tech. Since human and bird vision doesnt line up perfectly, there are wavelengths visible to birds outside of our vision.

Well, since there are alternatives that achieve the same, but invisible to the human eye, i still think its an annoying choice.

I used to be curious about switching to proton