Granted legal action and international standards are potentially the most effective. Trouble is, legal action is (a) expensive -- lawyers always make sure they're the biggest winners -- and (b) take a long time. For starters, who's going to foot the bill? Especially given the ever-present temptation to devise yet another inexpensive (relatively) work-around to M$'s moving target.

Until the legal path comes to fruition, interim solutions are needed. For this dumpster diver, the preference is just saying "no", but clearly that won't work for all.