I don’t see anything about point-of-sale donations in that link. Of course a business can write off an actual donation they make, but they’re not donating anything if they are just collecting donations from customers and passing the money along. I can find no evidence to the contrary.
I can’t find any evidence for this being true in any country that speaks English as their primary language. Do you have evidence to the contrary?
This is not true. Customers can claim their point-of-sale donations on their taxes, but the business that collects the donation can not.
https://taxpolicycenter.org/taxvox/who-gets-tax-benefit-those-checkout-donations-0
Edit: My link is for USA, but my understanding is that the principle holds in most places.
What countries is it different in? I couldn’t find any evidence of it being true in any English-speaking country.