The kind of treatment these apps mete out to nurses is illegal, app or no. In an important speech just last month, FTC commissioner Alvaro Bedoya explained how the FTC Act empowered the agency to shut down this kind of bossware because it is an "unfair and deceptive" form of competition:
https://pluralistic.net/2024/11/26/hawtch-hawtch/#you-treasure-what-you-measure
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