It's not always the case, but usually the bigger the company is, the more protective they are of their IP. ViacomCBS is the biggest one, though I'm not sure if it's changed since the merger. WB, Sony, Disney, and FOX are very strict. NBCUniversal is slightly more laidback, although do block/takedown on occasion, sometimes on older stuff. Fremantle is pretty laid back as well, and only block if they actually release the material someplace.
Were the KESQ and WMC takedowns more of their parent company's thing?
Except on a few occasions, I'm glad most local newscasts remain untouched.
I wish all media companies did this, so they at least get some money out of it, instead outright taking down stuff.
I lot of the users in the "Vintage TV Community" don't do it for money, they just do it to archive material that hasn't been released anywhere.