From what I anecdotally see (outside US) some men got frustrated with society and just don’t want to work. Everything they need seem to be found at home, similar to the hikimori in Japan albeit not so extreme. It’s sometimes (so not always) related to dating failures. I could argue that dating is getting increasingly difficult for the heterosexual male and that paired with bad jobs would make some men think twice about participating in the society game. Some other people linked articles/studies talking about this so my non-scientific observation can be supported somewhat.