Seriously, describe to me how you'd steal a coffee with a doublespend and why it'd be worth it to even try. Spell out the economics and odds of success.
Except WHOOPS now there's a mug shot of the dude stealing and an immutable record of his theft AND the miner who aided him. Pool operators start bouncing that guys blocks for sport??
Like say I bought a $100 microwave with 0-conf and got lucky enough to make it out of the store and double spend the $100 - the store will then send my mugshot to the local police.
I mean you can get it to confirm on the blockchain. That's not really what I'm getting at. I'm wondering how someone would steal merchandise of sufficient value to justify the effort.
If the merchant requires a good miner fee to make sure the txn propagates quickly and gets "first seen" there's minuscule chance you'll get lucky unless you collude with a miner.