Well, humans are synonymous with greed, and really, once they've tasted a win from investing to something like this, they'd keep going since they think it's easy to profit. Even if they get scammed countless of times, they'd still continue on.
The issue of Defi exit scam doesn't seem to freak Defi investors. There's a philosophy of higher risk, higher reward. The investors are aware of the reward and are willing to take the risk Inorder to get the best reward. I agree that definitely exit scam is as popular as it was during the ICO's where we always heard of ICO's scam, but more people were still investing in ICO's.
Well, they never think of it as a scam, they don't think much of it so they just probably think of it as a loss of investment. It is a way to profit though, so I guess it''s rather understandable why they keep investing even after all the scams that happened, but really, wouldn't a little bit of research be fine to do before investing? Blindly investing would only lead to more exit scams being made since they think there are mindless investors out there.
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That's why there's a separate part of the forum with regards to advertisements, bounties, and signature campaigns. I doubt you could really blame the forum from housing scams, especially since anyone is free to use the forum. It's basically like blaming the banks for money laundering, stealing, etc.