Wealthy people usually own income-generating assets like small businesses, valuable patents, or shares.

The "spend €50 on crypto and end up a gazillionaire" thing only worked because it was a tiny, rapidly-growing market. Now that there are hundreds of millions of us stacking, there's no real asynchronisity of knowledge to leverage and it's become a relatively-reliable savings vehicle, with unusually high returns.

Best deal around, but probably won't make you very rich unless you already are and can therefore buy loads of it.