It's entertaining that two companies run by devout liberals would be comfortable with Twitter when it was run by like-minded liberals but now that Twitter might be owned by a moderate person they don't know where to turn. It's as though they suddenly found out their significant other was an ax murderer.
But that's OK, McDonald's has done itself more harm than good with their Twitter account. The company would be better off without it. That much public dialogue can only do harm to a brand.
No one knows where Elon Musk will take Twitter (certainly not Elon Musk) so it's best to stay out of the way.
Companies in a quandary might take a look at the In-N-Out Twitter account. They throw up a pretty product picture a few times a month but more importantly they prominently display their 800 number for customers to call with comments or complaints. Kind of old fashioned, huh?
I don't know what will happen with Twitter but my gut tells me Twitter's days as a promotional vehicle are over.