It is harder to keep bad data out than it is to keep it filled with good data.
GPT definitely wins out if you want more novelty/variety in your fake data and are willing to accept extraordinarily higher cost, less rigor, and less reliability. I'm sure there's some occasion when those criteria win out, but Faker's pretty decent most of the time.
There's plenty of research into AI safety. There were some damn coups going on over AI safety. The general public defines AI safety as Skynet and homemade bombs, but it's also things like this - political manipulation, astroturfing, fake data, the risk of another industrial revolution.
It's something we should be slamming the brakes on, but most of the people calling out AI safety are also building their own B52 bombers, so nobody takes them seriously either.
80000 Hours has been telling people to get into AI and nuclear policy for years now. Hopefully we have some competent people in govs who do something.