As you saw in the thread, he privatized all of his information/posts and started a blog website that makes money. He was having forum members privately message him to go to a website that makes money off of your visit. He decided to make money off of his information instead of helping people for free.
thecandidadiet.com is also a website that makes money off of your patronage. He was essentially taking away people from this website to make money which isn’t something that is chill to do on the internet in general. Its like going to a cancer website/forum and telling people to visit your own cancer website that has advertisements and products, etc. Or its like going to a commercial car website/forum and telling people to visit your own car blog. Craigslist doesn’t allow this if you didn’t know, its a widespread general policy that most websites have to ensure their interests.