I have to point out that Simon Cowell is going to become a new judge on America's Got Talent next season. I hope they bring back X Factor in a few more years, though, or invent a new show that does groups in addition to solo singers, because The Voice only does solo singers.
And I also noticed that sometimes, when going solo, their material is sometimes more explicit than when they're in a group. For example, Justin Timberlake's solo material is more explicit than his material with N*Sync, and Nick Jonas' solo material is more explicit than his material with the Jonas Brothers. However, there are exceptions: British pop singer Ellie Goulding is a solo singer who does not sing explicit lyrics, whereas Swedish pop duo Icona Pop and American pop duo Krewella sing explicit lyrics. Overall, though, when singers are in a group, they're usually more modest than when they go solo.