it is The Jevons paradox [1]. I have seen it as well happening when I migrated a client from a standard cloud architecture to a serverless architecture.

>>> In economics, the Jevons paradox (sometimes Jevons effect) occurs when technological progress or government policy increases the efficiency with which a resource is used (reducing the amount necessary for any one use), but the rate of consumption of that resource rises due to increasing demand.

[1] https://en.wikipedia.org/wiki/Jevons_paradox