perverse incentive
incentive that has an unintended and undesirable result that is contrary to the intentions of its designers
en-US/pɚˈvɝs ˌɪnˈsɛntɪv/
en-GB/pəˈvɜːs ɪnˈsɛntɪv/
incentive that has an unintended and undesirable result that is contrary to the intentions of its designers