Here's the correct answer folks. This is a well-known issue with those older Christmas shows or movies. Blame the people that own the rights to the shows/movies, NOT companies like Netflix, Amazon, etc. One example of this is Rudolph the Red-Nosed Reindeer. The contract that stations or the network has with Walt Disney only allows broadcast by OTA, cable TV, or satellite TV.
Disney doesn't own the rights to Rudolph. Follow it far enough up the chain and you'll find Comcast, through NBCUniversal, owns the rights.
Curiously, CBS (not NBC) owns the exclusive broadcast rights to it. The CBS license predates NBCUniversal's ownership through their purchase of Dreamworks.
ABC Family, a Walt Disney Company, owns the streaming rights through Freeform.
Crazy how NBC, a legacy broadcaster, owns the IP (through an acquisition) but doesn't have any of the broadcast rights, which are held by two competitors: CBS and ABC.
Many of the "classic" shows, not just the Christmas specials, are tied up in exclusive distribution. As media companies are bought, sold, and merged, it ends up making really weird situations where direct competitors can't use their own IP because of contracts.
A great modern example is the Disney MCU and Sony's rights to Spiderman. Sony held the rights to Spiderman before Disney's purchase of Marvel. That means Disney can't use Spiderman, even though they own the IP. Disney and Sony obviously came to the conclusion that working together instead of fighting one another is the best way to proceed but it was dicey for a while.