It’s a friendly transaction between users purely out of the desire to help, and leaving it available to those who have the same question.
Further, it’s a transaction that Reddit facilitated out of their own pocket. I think people are being extremely petty about it. It’s best to just mourn and move on, we can still appreciate the golden years that Reddit gave us.
For weight, they forgot to add: if it’s for advertising a price, it’s in $/lbs (though you will be charged in $/kg). The butcher knows damn well that steaks advertised at $15/lbs sell better than steaks at $33/kg.