Wow 9,256 Bitcoins! Enough to buy a hamburger!

Details matter, I hope it is on by default. I don't know about you, but as long as the merchant gets what they requested in the fiat form, it should not be up to the merchant to "enable" lightning.

I hope it isn't opt in.

Only if retailers offer an incentive (like 2-3% lower price equivalent to the credit card fee). Otherwise nobody cares