Quantum computers are still in its infancy, and a lot more work is needed before we can even begin talking about practical, effective use. Consumer market readiness is even further away.

It's probably not worthwhile for quantum computing chips to enter the consumer market, because (AFAIK) quantum computers are only very good at solving a very specific set of problems (e.g. integer factorization), but their advantages over classical chips diminish (or even become negative) for general purpose computation. Of course as quantum chips develop, quantum algorithms will develop/evolve with them so that might change.

There have been some skepticism over whether their quantum computing chip (and similar ones that other companies develop) is actually a quantum computer (e.g. whether true quantum entanglement was observed).

There are other companies doing this, such as IBM.

Could a quantum computer mine bitcoins?

Affordability will come, the really difficult problem with the techology from a portable perspective is you need an exceptionally low temperature and very low vibration environment otherwise you'll never anneal.

Yer qubits get too warm and shakey in your pocket...

There is no need to keep them there. You can just ssh to some qbits from your pocket.