This, for sure - if there were any risk of quantum computers with 64 or 128 functional qubits, expansion would be a matter of engineering - the development of real, actual, functional quantum computing is on the order of nuclear weapons development. The US government would make it secret, take it over, and scale it up to 1024 bits for immediate and near total cyber dominance; something like pre-emptive strikes on bank accounts, total pwning of adversaries' secure systems, planting command and control malware everywhere, grabbing intelligence from anywhere the administration saw as valuable. There are a ton of dead drop encryptions. They could move btc from Satoshis wallets and wreck crypto value.

Quantum computing research you hear about is "neat lab experiment" fluff, or a demonstration of corporate technical acumen and research capabilities. You won't hear about real quantum computing until well after it's been used in geopolitical conflicts.

Is there a QC out there that can perform a commercially useful computation? No, not yet. And yes snake oil is abound. But the reality is not two categories, it's a spectrum. Some are more useless than others.