It was totally deliberate, with aforesight, what would happen was well known, yet they went ahead with a scam anyway instead of an actual attempt to correct that known scam, so it was just another scam. Using the excuse that it was a time of scammers, an age when scammers walked the earth, the age of scams etc is just the usual scammer patter.
-MarkM-
You're joking right? They obviously tried to do something about it.
Feathercoin's instamine was 3 million coins, and it remains 25% of the total coins created. It took 18 days to match the coins created on feathercoin's first day.
Worldcoin's instamine was 445 thousand coins, and it remains 3% of the total coins created. It took 3 days to match the coins created during worldcoin's instamine.
There have been numerous implementations to remove the impact of the instamine, and as coins go, the WDC instamine was largely contained.