Money ruins artists, same for footballers. I have so many great musicians in my music library and many of them are unheard of struggling to make anything but the music they make is exceptionally good. I rarely buy any but I did buy a physical album for the first time in ages this year.
That's the life of a singer/actor. Most of them will make a movie/album, then just enjoy the millions of dollars for a few years, then come back and work some more over and over. But then there are some, that when they've made it, just don't care any more and take off. Bieber will probably buy a yacht and/or an island and live on that. Buy a bunch of jet skis and have a wonderful life. I don't blame him. If I had that money I wouldn't spend my whole life working either.