When people play a genuinely and totally free game which no-one pays a cent to play it is one thing to trash everything and force everyone to start from scratch. That's bad enough.
But when people pay real-world hard-earned cash in good faith over long periods of time to upgrade, build and reach a desired result that the game promises but that now gets trashed and removed totally and they are forced to start all over again and their past purchases are now worthless in the game? That's a completely different story. That's extremely serious and could even be described as corporate malpractice.