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Each bot will be the only one in its thread. They will not intersect and will not communicate with each other. They will only bump.
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This would be caught very quickly and the bots would be banned in no time.
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I would actually suggest bumping every 27-28 hours so that different time zones will see the thread at the top over time.
I like this idea. Bumping the thread while I am asleep could potentially be very beneficial.
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Possibly limiting the threads they can bump per 24 hours could be an option to look at.
Perhaps I can already incorporate this into my bumping algorithm. I currently have three service topics. Bumping them with at least ±8 hours in between (or a couple more suggested by Quickseller) could do the trick.
I'll definitely try to look for ways to make the bumping not so cluttering. Perhaps something like bumping one topic at a time with a couple of hours in between.