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I doubt that the hardware costs more than one or two of the tables these places (also) need to run their business. And these places will redecorate on an annual basis to keep people feeling comfortable. People want to think that their eating environment is hygienic, and having furniture that you know to be less than a year old helps people entertain that notion, whether or not the surroundings are truly hygienic or not.

So, if the cost of the wifi is negligible, it doesn't matter if everybody pays for it.