The hidden strictnesses (triggering per-day costs even when you are below what is described as a per-month allowance) make me think of "glacier pricing" where g

The hidden strictnesses (triggering per-day costs even when you are below what is described as a per-month allowance) make me think of "glacier pricing" where glacier is a common noun instead of a proper noun. I.e. 90% of the costs being hidden below the water.