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Good catch!

They didn't comment-farm. They simply extracted all the signup bonus money, probably moved it all to a proper main account by now.

I hope they stopped the bonus money, or at least reviewing it first before allowing this to happen again?

All accounts still have their signup delegation. Steemit inc isn't paying much attention to this I am afraid.

So it basically is already lost value, or at least "on the books" as already spent?

To-date only 0.5 Steem is actually given to sign-ups, the majority of initial voting power is only delegated to new accounts, it remains under ownership of @steem.

those were older accounts when the actually given Steem used to be more. That has all been taken, yes.

Thanks! I have only followed the signup method when I first started on Steemit, about a year ago.

I've just posted some Cookie Crumbs based on this lead.