This is what I was hinting at.
"The Dow Chemical Company" is a subsidiary of Dow Inc. which is a DJIA component.
Is this a symptom that Dow Chemicals is to be spun out of Dow Inc, or is this just bad blood because Austin Dillon is underwhelming the sponsor's expectations?
I don't know if that's what's going on here. Usually the way contracts are written nowadays the new company would still likely have to honor that commitment. Like in the case of Axalta, before it was officially called Axalta the car for awhile just said Cromax Pro on it.
From what I found out doing some reading, Dupont and Dow merged a few years ago and so basically what was the main company of Dow is now Dupont. In April this year, they did spin off Dow Inc. into a new company. That company is what owns the Dow Chemical Company.
So it's possible that maybe "old Dow" (now Dupont) was the ones really doing the sponsoring and not the "new Dow" (Dow Inc.). And so if that's the case, maybe Dupont doesn't want to be a part of NASCAR sponsorship so they ended it.
Likely it's just simply something going on behind the scenes that we as fans aren't seeing yet.