You make a good point.. In general, no one cares enough to track all this down. That is true. So that makes me wonder.. who does/would care? So in a capitalist system, until the day the flow of money is impacted, generally nothing changes.
So if Reddit really is all (or vastly) bots, then aren't advertisers paying to advertise to bots? And if that is true, at a certain point some metrics will show the yield on their investments is bunk.
Maybe that is how it collapses. I can hope.