A job is a contract. If you don’t want the contract to be used that way, don’t write it that way. I don’t feel bad towards my employees or coworkers who wait to give notice until shortly after annual bonuses are given out. My previous boss encouraged me to stick out my job another couple weeks until the next stock vesting date.

As long as both sides sign the job contract willingly, without a severe imbalance of power, it’s not abuse. It’s business.