5. Most of the exploits you've mentioned here are either fixed or has extremely low benefit. The blatant cheat ones are fixed and meme <insert skill here> isn't profitable because the dungeons don't drop anything
Removing the feature is not a fix tho.
Removing loot from dungeons so others can't cheat
Removing gold from fishing so bots can't fish for gold
Removing character based guardian missions so people don't exploit it
Removing card fusion system after dupers getting their cards in the first day, without removing the duped cards (yes, that was fixed, thank you for making us peasants able to obtain cards too)
Introducing new items in one patch and making them completely useless in the next, so you are left with outdated stuff and have to go grind someplace where it doesn't drop or has 0.000000000001% of drop.
Game slowly is removing casual players so that only elite players are left to play