Welcome back to TechCrunch Mobility — your central hub for news and insights on the future of transportation. To get this in your inbox, sign up here for free — just click TechCrunch Mobility ! Tesla earnings came and went, and much of it fell into the “we expected this” category. Investors seemed surprised by the $1.4 billion in free cash flow, which gave shares a brief bump, and revenue met or slightly exceeded expectations, depending on which batch of analysts you reviewed.  The earnings call, however, did deliver one eyebrow-raising moment that prompted readers (including some ex-Tesla engineers and other founders in the industry) to reach out to me with some schadenfreude-tinted prose. CEO Elon Musk admitted that millions of Tesla owners will need hardware upgrades to run a future, more capable version of its Full Self-Driving software that doesn’t require human supervision.  There are financial and legal implications for Tesla.…