Whack-a-mole Definition

noun

(idiomatic) The practice of trying to stop something that persistently occurs in an apparently random manner at the point where the occurrence is noticed, such as terminating spammers’ e-mail accounts or closing pop-up advertisement windows.

It’s like whack-a-mole: as soon as you fix one, another appears.

Wiktionary

Origin of Whack-a-mole

From the arcade game Whac-A-Mole, which involves quickly and repeatedly hitting the heads of mechanical moles with a mallet as they pop up from holes.

From Wiktionary