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wallet can share the payment pre-image with Strike servers, Strike servers confirm that that was indeed payment they just received on one of the terminals and then the Strike server will immediately pay out some % sats to the wallet dev.

This won't work very well. Any LN node that routes the payment will know the preimage once the payment succeeds. The wallet would have to share it with Strike before the payment is made but regardless any LN node on the network would want to submit any successful payment they routed to Strike in order to redeem their share. I'm sure they could do something to battle the spam like blocking the dev account they are paying out to if there's too many false claims. But there's a privacy concern if this isn't communicated to the wallet user that this is happening without their consent. Is the user sharing all their payment data to the FOSS wallet? Or are they submitting it to Strike themselves and associating IP address information? Also I doubt they will provide this without KYC'ing the wallet dev.

This is also an analytics concern with them trying to aggregate as much proprietary knowledge about the network and who is using what. It's good they are trying something to pay open source wallet devs, but they could just like, pay open source wallet devs.