Granted, the plural of anecdote is not data, but I've filed six DMCA takedown notices for photographs I've placed under Creative Commons licenses but were not used according to the terms of those licenses. Every company I dealt with took swift action to take down the infringing material.
I am sure those were reasonable demands but the proposition here is for a nuisance "work to rule" campaign. Understanding the political motivation, the big companies could call your bluff and wait for a court order, expensive to obtain.
Not a real downside risk, but my point is that the circumstances are not directly comparable once the intention is to kick the hornet's nest.
