Instacart and Uber have filed an appeal in a lawsuit against the City of Seattle over a new law regulating the driver deactivation process.The companies argue that the ordinance violates their First Amendment rights and is unconstitutionally vague.A federal judge rejected their effort to stop the enforcement of the law, which went into effect on January 1.The law aims to provide more job security to app-based couriers, delivery drivers, and service providers.