I didn't feel like writing a novel that accounted for every edge case and I knew if my comment got any traction, folks like you would show up passionately pointing out the details I omitted or glossed over. Here we are.
You are correct, there are exceptions. You are correct, crypto is not a single entity. defi in particular is an area where there are a lot of products catering to real user needs as they're marketing to people who already own crypto. And for them, whether they need a db or not is irrelevant. Those users demand decentralized products, so if they want to serve them, they really don't have a choice. Uniswap would be committing suicide by deciding to use a db at this point.