Someone was asking (in the thread that is now deleted) for a source stating Black Lion key runs were not an exploit.
Quote from Gaile Gray herself:
Are you exploiting when you farm, that is, play the same area over and over again? Nope, not unless you’re using a macro or a bot to do it while you sleep. What I was told was that the devs felt that the time spent was acceptable in relation to the rewards. John later confirmed that it wasn’t an exploit, so I believe the question is covered now.
Gaile Gray
Support Liaison
ArenaNet
link to original post: https://forum-en.gw2archive.eu/forum/support/account/Are-Black-Lion-Key-runs-an-exploit/first#post1222647