I think the "charity bundling" concept is just for P.R. The company presents the big check at the end of the campaign, and the public then credits the company, even if the company itself contributed nothing beyond a little (deductible) personnel time.
The Ronald McDonald House perfected that mechanism. Some retailers used to do the same with pooling customer MDA donations, then showing up to the telethon with a big check... with the company name on it.
Right now, for a grocery store, that means they can put butter on sale that women will buy for Christmas cookie making, and market sprinkles and decorative sugar at higher prices (or with a coupon) to increase customer value. That MDA heart that you bought on Labor Day weekend helps assess the effectiveness of that sort of promotion.
I’m sure they’ll stay competitive in the future.
And from what I know, that’s less about survival, and more that they can’t expand horizontally anymore, and the new owners (the Albrechts both died in the past years) also want to expand vertically into other market segments.
Supermarktblog documents these changes quite well, IMO.
https://www.supermarktblog.com/2017/10/02/aldi-nord-in-renov...
I'm happy to be convinced otherwise, though. Let me know.