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Note: I guess this could be more complicated like we could have 4 lists of people, 1 for each game (ex. someone might want to only play four in a row and not any of the other games) but first let's…
I am pretty sure you could get like 80 akorns in 15 minutes if you speed-played through these games with someone else. Without even cheating (just using a second account and making it lose to your main account) - just find another user and play chess or gomoku as rapidly as possible for 15 minutes. Assuming each game takes 3 minutes and both of you win and lose equally, at the end each user would make 26 or 34 akorns.
This would be much faster than trying to make akorns through commenting. Of course, if everyone did this then they would probably lower the win amounts or make the loss amounts equal to the win amounts. But no one even tries this.
The main minus is that well, you are basically just spam clicking instead of using the forum how you are supposed to or even playing the games seriously trying to win. But you could just be doing something else in the background like listening to music or a podcast.