zeb: I would like to know the reason behind getting poor individual r&f to site their own details in the letters
The purpose, apparently, for requesting individual personal details was because Russia has a law that states that any Official that works for the Russian government must answer correspondence addressed to them but only if that correspondence has the personal details attached to the letter
The anticipation was that each and every letter sent would have to be answered individually. Which, of course, is so ludicrous int this context as to be laughable. There were JWs over on jwtalk that were gleefully making sure they sent as many letters as possible so that the Russian officials would have nothing else to do but deal with the mountains and mountains of letters and saying that if Putin didn't answer them that he would be breaking Russian law
The OP's concerns are valid. The org knew that a campaign could be considered a DOS action because they had already got into trouble over a similar action in Russia. If my memory serves me correctly (I can't seem to pull up anything because the internet is flooded with story after story after story concerning the letter writing fiasco), the org was told specifically that they couldn't send emails because of an email campaign that the org launched inside Russia prior to another event that happened there. I will keep looking for the documentation on that, but I seem to remember that the Russian JWs had tread very closely to being charged with DOS in the recent past over their emails flooding official offices and that it why the GB changed their tactics and went for the letter writing campaign instead of an email campaign - they had already been warned
The GB knew exactly what they were doing