The article actually explicitly discusses your first point: that people can be affected by the experiment. It's called Hawthorne's Law, and the author discusse

The article actually explicitly discusses your first point: that people can be affected by the experiment. It's called Hawthorne's Law, and the author discusses what types of laws might be good / bad to perform these tests on. Your second paragraph isn't particularly applicable, because what you're describing doesn't meet the requirements to be considered a double blind randomized trial, modeling after drug testing policies.