Omg, so many opportunities for evil:

• retrieve earplugs from purse, put them in, press the button, hand the staff a $5 cash tip and a pair of earplugs.
• loiter outside offering pairs of earplugs to anyone entering the business
• call the business, pose as a vendor so I get transferred to the manager, and play a recording of the sound.
• leave fake reviews claiming the employees are on a covert malicious compliance strike and to show solidarity everyone should push no-tip.
• before hitting the button ask to speak to the manager and push no tip while making eye contact with them.

The real problem is the employee who didn't create the policy would generally be the person subjected to any mischief so it'd lose its fun about the time the manager barred me from coming back the fourth time I no-tip stared them down.