The Consistency Principle can be annoying too when used exploitatively. I walked away from a gym membership once when they tried to charge a joining fee in the last minute.
Thank you for bringing up Cialdini. The scarcity tactic is documented in Influence, The Psychology of Persuasion. In the scarcity chapter he ties it to the “loss aversion” cognitive bias, although he doesn’t label it as such.
https://www.goodreads.com/book/show/28815.Influence
https://thedecisionlab.com/biases/loss-aversion/