It’s easy:

Are you requesting I as a worker dedicate any part of my time, and/or usage of my personal resources to accomplish something for YOUR business? Yes it’s part of the work day.

This would create an issue where they only hire people in close proximity. This is terrible, for a number of reasons.

Nepotism gets exponentially worse and is then excused, poor areas will be effected the most because they lack businesses

Subsidize based on type of transportation used? Public transit is mostly subsidized, and private transportation is the least subsidized. This would make employers seek out poorer people.