> * If everybody does it, it won't work so well

Indeed, this is a complex problem to solve.

And the "it won't work so well" of this is probably a general chilling effect on trying to fix things because people won't roll them out fast enough anyway.

This may seem theoretical but for example in websites where there are suppliers and customers, there's quite a chilling effect on any mechanism that encourages people to wait until a supplier has positive feedback; there are fewer and fewer people with low enough stakes who are willing to be early adopters in that situation.

What this means is that new suppliers often drop out too quickly, abandon platforms, work around those measures in a way that reduces the value of trust, and worse still there's a risk of bad reviews because of the reviewer's Dunning-Kruger etc.

I think the mechanism is important for people who really must use it, but there will absolutely be side effects that are hard to qualify/correct.