@IsaacKing and @DesTiny together manipulated @DesTiny 's personal goal market to earn Ṁ16,000 profit. Will manifold users find that ethical?

Resolve to Yes if my "ethical" comment below get more likes at market close
Resolve to No if my "unethical" comment below get more likes at market close

What happened:
@DesTiny had a personal goal market on whether his profit will be above Ṁ1,500 by the end of Jan 1 2023. His profit up until Dec 31 was still -Ṁ9,000 and he holds no large enough position that could pull his profit up to Ṁ1,500. The market price was hovering around 5-10% up until a few hours before closing. To the surprise of many, @IsaacKing bought 20,000 Yes position and pushed the price up to 90% before the market closes.
https://manifold.markets/DesTiny/will-my-profit-be-above-1500-by-the

One the next day, @IsaacKing created a private market and artificially generated Ṁ19,000 profit for @DesTiny, pushing his total profit to +Ṁ10,000 (and then +Ṁ23,000 with another private market)

Eventually @DesTiny resolved his personal market to Yes. @IsaacKing got a whopping Ṁ18,301 profit from it, while other big No position holders such as @GeorgeVii, @ahalekelly and @Lifejacker lost Ṁ9,127, Ṁ3,800 and Ṁ3,050 respectively.