In the discussion posts for X-Men '97 I also share the stream link for where people can watch it. That's basically the digital equivalent of sharing a link for ticket purchases. Ultimately I do that so it's easier for people that are interested to follow-up and access the media.
On reflection I suppose you're right it's an ad but any sort of promotion is technically an ad, so I guess based on that almost every post in this community so far would qualify (release news, trailers, etc.).
If it actually bothers people, I'm willing to have a meta discussion about the future of this community and where we draw the line about what type of ads that we do or don't want.