Instead of big tech companies profiting off your data, you can profit off your data and output. A critical thing that decentralized networks have solved is the alignment of interests between the developers, the users, and the platform creators. They all share in the success of the network and you can build on it. Facebook, Twitter will deplatform you when you get too successful building on their API or for a host of other reasons. They can and do change the rules at will.
Web 1.0 - Read-only.
Web 2.0 - Read & write.
Web 3.0 - Read, write & own.