Some sort of currency/payment system seems quite likely if Tesla solves full autonomy. Full autonomy will allow them to at least gain huge market share in the mobility as a service market, perhaps completely dominate it. The amount of money that will flow through the Tesla Network ecosystem is absurd, and should give Tesla a gateway into launching its own payment/bank/financial services something.
I believe somebody asked if the autopilot chips could be used as AWS data centers during either the autonomy day or the shareholder's meeting last year. Elon didn't seem to be too interested, but said there "could perhaps be some sort of angle there". This might also be pretty difficult, because with FSD there will likely be very high utilization of Tesla's vehicles and its hardware chips, which is also why I don't think V2G will be that big long term, and only interesting until full autonomy is here. Autobidder does seem great, but more so for distributed powerwalls, powerpacks, and megapacks.
I doubt they'll compete with Amazon's actual website and selling of goods any time soon, if ever, but for sure Tesla is on track to be the king of all forms of mobility over roads, perhaps also many other forms of terrestrial transportation.