I don't mean to go too much against the narrative in this thread, but aren't cameras on glasses necessary to achieve AR? Are people concerned about these glasses just because it's Facebook, or is there broader opposition to AR technology?
For me, it’s because Facebook. They have no track record of trust. I work for a significant Silicon Valley tech company and have seen up close the types of shenanigans that have been attempted by Facebook — especially with their mobile apps. Don’t trust them.
Overall, I would guess that there is no track record of trust because expectations remain unclear. Concepts of privacy, data usage, and such didn't exist before Facebook and others. I suppose I am not eager to assume malintent outside what is standard for any business operating for the sake of profit.