I don't know if they can "harvest" anything, right? But they can certainly abandon the "darknodes" which are required to burn (in order to access the BTC that was unlocked as a result of the burn).

Wrapped Bitcoin is a scam.

You are not alone in that conclusion:

I used to hold btc on Ethereum. I had been used to holding various kinds, including wbtc, renbtc, and tbtc, but after seeing Ren just say they're going to shut down leaving all remaining erc20 renbtc worthless soon, I won't hold any erc20 btc again.

https://twitter.com/scupytrooples/status/1604318598704803840 [Nitter]