You’d have to check based on your country, but like @echo64@lemmy.world said in a reply somewhere, companies as far as I know don’t get tax breaks when you donate at checkout.
They do it to look good, don’t get me wrong, but telling people not to donate at checkouts based on a myth is really only harming the charities.
I don’t donate because I’m heartless (is that a win?).
What a world it would be if everyone had minimum 50mbps internet. “Good” rural internet is 1mbps for a lot of peeps, and a whole lot more people have a whole lot lower speeds.