Question: Why doesn't anyone from the Afterlife try to stop Lydia from doing her TV series? In the first movie, Juno said that the living must not discover evidence of the Afterlife.
Answer: I agree with Ted Stixon - many people have similar shows/online channels, and many people don't believe in the content. So, the afterlife officials are probably not concerned about all of them. There are people in real life who claim to be in contact with the deceased, as well as psychics and people with various religious beliefs.
Answer: My guess would be that it's a combination of a few factors. The first is that she's far from the only one doing that sort of program. There are hundreds of paranormal shows, YouTube channels, etc. It would start to look very suspicious if suddenly things started happening to everyone who makes that type of content. Second, a lot of people just flat-out don't believe in things like ghosts and the afterlife. And a lot of those shows are faked, anyway. So while Lydia is earnest and honest, a lot of people won't believe it. Therefore, her show isn't exactly super risky for the afterlife. And finally, the original movie really doesn't dwell on that idea; it's basically given a few brief lines of dialogue in like one scene, and that's it. So you could also make the argument that this movie just sort of ret-conned or is ignoring that idea due to it being such a minor, unimportant element of the original.
TedStixon