Seems to me that there’s at least two large industries that many people interact with but suffer from centralization. Short-term rentals (e.g. Airbnb) and gig-work (e.g. Uber, DoorDash, TaskRabbit). These companies act as middlemen, control who is allowed on the platform, take a large cut of funds, and remove you or remove work from you at any arbitrarily defined moment. This can be disruptive for people who rely on these platforms to earn income. nostr could fix this. Give the end users the tools and the freedom to choose who to trust to proceed with the transaction. Give people their full earnings, and allow people to pay what it actually costs.