Again, you're assuming that the only thing with glasses and a camera that can exist will be sold and operated by Meta. This is not the case.
The only reason why there's not much competition yet is the expense. Meta can sell the glasses at a discount because the wearer (and everyone/everything they look at) is what they're actually selling.
Eventually there will be glasses running regular Linux that people can do with as they please. Then the real innovation will happen.