It seems that ultimately this just subsidizes the commercial real-estate owners.

1) Force companies to not have free cafeterias

2) Workers have to buy lunch from local businesses

3) Restaurant Location becomes more valuable given the large number of workers forced to find lunch and buy it.

4) Raise rents on restaurants because space is now more valuable, since it is basically subsidized by nearby tech companies.

5) Restaurants pay higher rent, landlords make more $$, due to California Property Tax policy, landlords do not have to pay proportional additional property tax on their now more valuable property.

The reason something like this is considered speaks to the power of commercial real estate to shape policy for their own benefit.