I'm telling you, there will be a streaming service that will deepfake ads into finished movies. Darth Vader will turn at the at the camera and say "No, I am your father... and you should buy the Elon Musk biography on audible dot com for free"
“One does not simply walk into Mordor…” Boromir turns to the camera and continues, “…unlike this video’s sponsor - nordvpn! With the code ‘flame of the west’ you can simply walk your way into an 85% discount off the price of a full years subscription! Thanks nordvpn, and now back to the council of Elrond”
I occasionally see those types of ads in subs downloaded through the Plex UI, but usually it's in an intro or at the end. Haven't seen them in the middle of a dialogue yet.
Some of them try and sneak an ad at the start or end. It's rare though.
Most stuff now is mkv which has a good chance of including the subtitles straight from the Blu-ray or streaming service.
I tend to wait for at least a digital or physical release before downloading so I don't get a load of blurry crap with an ad for an Asian gambling site splattered across the middle of it.