I acknowledge a company's right to offer free charging to select employees; a private entity can do as it sees fit.
I also retain my right to complain about it, because I didn't get free gasoline, nor get to park "up front" where the chargers are.
Having seen where these things are located, it can be really random. I was at this brewpub in Sonoma County where their J1772 charging setups were close to the entrance, but their Tesla Destination Charging was a good walk away from the entrance. The former might have been paid though, although I think they might have been complimentary.
I suppose they can make those available to anyone including employees and customers.
I guess it's a free country and we're all free to complain about whatever we want. I guess I could complain that the business is providing free dog treats when I don't have a dog any more. Or providing free Wi-Fi if I don't connect to it. Years ago I remember hearing protests from taxpayers that they were older and didn't have children in public schools, and wanted their taxes reduced as a result.