Your quote is using a flawed/incorrect definition of "free": it is not,
according to some dictionaries (and all, some years ago) a shortcut for "free
of charge" or (in this case) "free from reimbursement".
1 a : having the legal and political rights of a citizen b: enjoying civil and political liberty <free citizens> c: enjoying political independence or freedom from outside domination d: enjoying personal freedom : not subject to the control or domination of another
2 a: not determined by anything beyond its own nature or being : choosing or capable of choosing for itself b: determined by the choice of the actor or performer < free actions> c: made, done, or given voluntarily or spontaneously
3 a: relieved from or lacking something and especially something unpleasant or burdensome <free from pain> <a speech free of political rhetoric> �often used in combination <error-free> b : not bound, confined, or detained by force
4 a: having no trade restrictions b: not subject to government regulation cof foreign exchange : not subject to restriction or official control
5 a: having no obligations (as to work) or commitments <I'll be free this evening> b : not taken up with commitments or obligations <a free evening>
6 : having a scope not restricted by qualification <a free variable>
7 a: not obstructed, restricted, or impeded <free to leave> b: not being used or occupied <waved with his free hand> c: not hampered or restricted in its normal operation
8 a: not fastened <the free end of the rope> b : not confined to a particular position or place <in twelve-tone music, no note is wholly free for it must hold its place in the series � J. L. Stewart> c: capable of moving or turning in any direction <a free particle> d : performed without apparatus <free tumbling> e: done with artificial aids (as pitons) used only for protection against falling and not for support <a free climb>
9 a: not parsimonious < free spending> b: outspoken c: availing oneself of something without stint d: frank, open e: overly familiar or forward in action or attitude f: licentious
10: not costing or charging anything
11 a (1): not united with, attached to, combined with, or mixed with something else : separate <free ores> <a free surface of a bodily part> (2): freestanding <a free column> b: chemically uncombined <free oxygen> <free acids> c: not permanently attached but able to move about <a free electron in a metal> d: capable of being used alone as a meaningful linguistic form <the word hats is a free form> � compare {h,5}bound 7
12 a : not literal or exact <free translation> b: not restricted by or conforming to conventional forms <free skating>
13: favorable �used of a wind blowing from a direction more than six points from dead ahead
14 : not allowing slavery
15: open to all comers