Many apps offer you your data if you want it. For example, Facebook. I think people overestimate how useful data is outside of the application that was tailor-made to handle the data in the precise format it's in.
I guess "Web3" (it pains me to even use that term) would allow another developer to reverse-engineer an application to digest the data as it exists on the blockchain, but... that seems like a pretty negligible improvement over the status quo with many very significant drawbacks. For starters, a Raspberry Pi has orders of magnitude better performance than the "Ethereum World Computer". To make that concession, I'd hope for a much better benefit.
but it is still locked into the walled garden. if 5% of Twitter users want to escape the platform when a billionaire buys it and reinstates Trump, their only option is to use an entirely new protocol (Mastodon).
if 5% of OpenSea users want to escape the platform, they can and already are doing so because OpenSea never owned the tokens and media on its platform to begin with. see: LooksRare, Zora, Rarible.
I guess "Web3" (it pains me to even use that term) would allow another developer to reverse-engineer an application to digest the data as it exists on the blockchain, but... that seems like a pretty negligible improvement over the status quo with many very significant drawbacks. For starters, a Raspberry Pi has orders of magnitude better performance than the "Ethereum World Computer". To make that concession, I'd hope for a much better benefit.