It's really a circular argument, because you're really arguing two different things. It would be foolish to say it's not life-changing money, almost any way you slice it. Even if they're blowing it, that's a change in their lives to that point. Plus, I'm sure many are making investments (maybe bad ones), rewarding parents and family members, etc... It's life-changing no doubt. You're admitting you're putting qualifiers on what your definition of life-changing is, and in that regard, you too are correct!
Can never resist the opportunity to share former pro soccer player George Best's quote on this subject: "I've spent a fortune on booze, women and fast cars... the rest I've just squandered!". He was the Yogi Berra of derelicts!