It is hard to buy this type of mass coverage along with:

"Wow McDonald's they really have a moral compass and listen to the people!"

If I was cynical marketer I would say make a couple of copies. And then pull it from your channel. Then spread those on social media.

they probably understand it’s impossible (or very hard) to fully delete viral content and that it’d get re-shared

PLUS they double dip as they get extra search traffic for their brand from people trying to find the video

the forbidden fruit is more enticing

I've encountered far too many people who actively seek out ads or look forward to them, people I usually respect, its baffling.

Outrage and clickbait has more than one form and it works surprisingly well on masses, part of orange mans success story. Just look at us discussing it, it wouldn't happen with (much more costly) normal MCD ad.