For a couple of years after I graduated from college, I pretty much fell into the category of "NEET". A number of factors - depression, graduating at the height of the Great Recession, lack of direction, general tendency to sort of get into a rut, etc. - left me basically just sitting at home most of the day. And I guess there were some vaguely positive aspects? I mean, I did read a lot of books and I didn't have a lot of responsibilities, so that was okay, I guess? But at the same time, I did recognize that it wasn't sustainable and that I didn't actually want to just keep doing nothing all day long.
I think that the "community" aspect to r/NEET is probably the biggest problem, because having people around going "ah, the NEETs are the true heirs of the great philosophers of old!" probably reinforces their positive feelings about their situation. In this, it's much like every other bad Internet community of idiots who gathered around some bullshit identity.