But... why were they using/testing it in the first time? It's not like not being paid was a secret. Or maybe they registered exactly to setup this sort of protest? Because they are totally entitled to protest against AI taking jobs, just the particular conditions are a bit weird to me.

I don’t know.

If I were to give them the benefit of doubt, I’d guess they joined because they initially saw this more like the AI vs chess type contribution where their contributions would be publicly demonstrated and praised rather than just used to beta test.

They might not have been aware of how many other people were asked.

They probably also underestimated the tool’s capabilities and then got worried for their careers after using it.

It’s pretty common for people’s perception of an opportunity to change after agreeing to it. I’d bet you’ve taken on paid jobs that were less exciting than advertised. Or gone to a party that was completely mis-sold by your friends.

I don’t think we’ll ever truly know the motives that lead up to this leak.

Because their work is being devalued by AI, wether they participate or not.