People getting something for free =/= People being rewarded for exploiting early and often.

OP probably wouldn't mind Greymoor key givaways. That's people getting something for free. By being lucky, they get to enjoy things. Everyone's happy. Nobody minds if people buy Chapters on discount or randomly win a stream giveaway.

But in this case, it's not a random reward. It's a reward for exploiting. People had to notice an anomaly (bug) and actively go to Greymoor (knowing they didn't buy the content), they had to run around the zone and do quests/loot chests/unlock Antiquities (knowing they shouldn't have access to any of that), and being allowed to earn Antiquities and Mythic items (which is why many people bought Greymoor in the first place) awards exploitation. Not something anybody should be doing.

Meanwhile people who noticed the bug but chose not to exploit (because it's unethical and against terms of service) end up with a net loss compared to people who exploited happily. That sends an incredibly harmful message to the community.