It builds on the foundational concept of informational self-determination, and highlights well the various schisms involved. Therefore, I remain also a little skeptical about the NFT/blockchain/etc. solutions at a non-technical level.
Of course, and especially regarding non-personal data, but with personal data you always have the fundamental issues discussed in the paper. At a technical level, for instance, you have the issues with the right to erasure, the right to correction, and some other rights; I haven't followed the blockchain space close enough to know where the state-of-the-art is.
Not sure because there isn't much historical data on this
Also this depends on how they calculate it but would love to see a breakdown by different applications. E.g. what happens if some proprietary software uses open source elements vs fully open source software