Mmmhmmm. Just imagine every few hours the game updated boosts to (for example) specific dungeons. If one has been popular then the nect interval you have a -10% loot and xp (number taken out if my arse). And these numbers posted clearly in and out of game. I think it wouldn't take too long before minmaxers have identified breakpoints for when each dungeon is "profitable". And not too long after that evegy dungeon would be about as profitable as every other.
I wouldn't mind at least trying such a system. Think it would be neat.
Once I've got my data under gdpr I'll start with those mass comment edit services (shreddit, powerdeletesuite etc) and do several overwrites. Then I'll request (demand) them ro nuke all my data. Obliterate it.