It's glaringly obviously so—at least to me: I've been around long enough to remember the first dot-com boom at first hand, plus various property bubbles, the credit default swap bubble, the original bitcoin bubble, and so on.
After a while you learn to recognize a new market bubble on sight. Unfortunately that learning time can be 30 years ... so youngsters ALWAYS think "this time it's going to be different."
https://circumstances.run/@davidgerard/114712748295654159