I think it has been an overall change in gamers attitude. In the 90'ies games were more puzzle like and figuring something felt like an achievement.
Nowadays gaming is more of a recreational activity and a player expects to find answers on wiki or a guide and if he doesn't... well, he will probably just give instead of trying to solve it.
That depends on the game, I guess, but in Civ4 forums people openly discussed game code revelations. In Adom, I think, giving away spoilers/obscure messages was mostly due to lack of new and unspoiled players. We will probably have influx of new blood, I am rather unsure if they want to remain unspoiled.
Tu sum, I think HoF type of subforum for spoiler free questions and answers would be the best solution.