it's true with what you say, at first everyone thinks like what you say, my prediction for the future that bitcoin will grow big enough, because bitcoin experts predict that bitcoin will reach about 50k. hopefully this expert's prediction comes true.
No, not everyone who thinks like that at first, at first I personally never thought if crypto is just a scam. No one knows the future, it's just a speculation that is not 100% true. Just make it as a reference.