Not exactly free (but why bother with details and pesky facts), it turns out they in fact do pay:

* Payroll taxes on their wages (trust me, I pay these on my employees)
* Social Security
* Medicare

I'm not here to defend or attack our tax system, I'm here to point out the "Ride for FREE" message is a nice sound-bite, except for the fact that its wrong.
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The charm of fishing is that it is the pursuit of what is elusive but attainable, a perpetual series of occasions for hope. -John Buchan