TLDR We have analyzed all Ordinal Inscriptions created since Bitcoin block 779832, which marks the introduction of the BRC-20 standard. It appears that 80% of all inscriptions created in early-mid May 2023 belong to a single person or entity that controls a single public key,
you found the unisat service... it's not one entity.
https://twitter.com/mononautical/status/1663383996561072129?s=46