I was in the UK for a few weeks recently, and everywhere I went there were notices advertising free cash.
But however many times I tried, I was unable to get hold of any of this free cash. Very frustrating.
Of course, the signs are not offering 'withdrawals of free cash'; instead, they are offering 'free withdrawals of cash'. In other words, 'free' is modifying 'withdrawal', not 'cash'. Or, using brackets, one might show it as [free [cash withdrawals]] rather than [[free cash] withdrawals].
Pity, as withdrawals of free cash sounds like a splendid idea.