But I'd be surprised if many drivers grossed more than $50K/year. If they earn less, the tax benefit of deductibility is even smaller.
Not a CPA so I’m pretty sure I’m oversimplifying this and there are lower bounds I don’t know about which prevent most gig workers from operating like this.
My comment was motivated by OP's question asking whether it was possible to "offset these expenses against their tax" (emphasis added). No, it's not possible to offset an expense against tax. It's only possible to offset against income. I frequently see people on HN saying things like "it doesn't matter if it's a ripoff because it's a tax writeoff!!!" If they actually look at their tax returns, they are surprised that an expensed dollar saves them only 10-20 cents, so the price definitely does matter.
Tax credits, on the other hand, are a lot closer to what people are usually thinking of when they say tax expense. If you install residential solar in the US in 2023, for example, you get a 30% tax credit. That means if you spend $10,000, your federal tax bill goes down by $3,000. If it were merely 30% deductible, then you'd subtract $3,000 from your income, which at a Doordash driver's tax bracket would reduce taxes by only about $350.
(I'm not a CPA, either, as any CPA can surely tell.)