The ways you've listed would work only once (each). With several hundreds of requests per year PM would pretty quickly run out of plausible excuses to not start

The ways you've listed would work only once (each). With several hundreds of requests per year PM would pretty quickly run out of plausible excuses to not start storing the requested info. Also - what is so precious about this particular request compared to 700 requests PM received last year (if we trust PM on that)? Also - the purpose of any commercial activity (which surely PM email service is) is to make money for their owners. How much money and for how long would come from PM if they constantly would be resisting authorities (or from authorities point of view - obstructing justice)?