If you think the answer is a blockchain, you are asking the wrong question.
It kind of feels like Dorsey wanted a blockchain, but their engineers found that blockchain-based social media did not work well and just built a federated network, so now they're going for some "inspired by the blockchain" angle.
Edit: I looked at the github, not the medium page, I see I'm wrong. It is some web3 BS
Where exactly does it say that BlueSky is yet another web3 / blockchain project?
The Medium post isn't from the BlueSky team, its from a random crypto blogger and even he doesn't reference where BlueSky is a blockchain or crypto token platform.
It seems like it models your data as a Merkel tree log, signed by an identity key that can be obtained through DNS. Unless they plan to add a namecoinish thing for identities you shouldn't really need Po* to "secure" that.
> We’re not describing what we’re building as a federated or p2p network, or as a blockchain network, because it doesn’t fall neatly in any of these categories. It could be described as a hybrid federated network with p2p characteristics, but it’s more descriptive to focus on the capabilities – self-authenticating identities and data – than on network topology.
From: https://blueskyweb.xyz/blog/3-6-2022-a-self-authenticating-s...
Not that it clarifies anything for me. It feels (I'm speculating) like they are very careful not to mention web3, but maybe that's because it really has nothing to do with tokens and whatnot and is actually just a protocol that lets people run their own social network servers. But it doesn't say it's that either. Some plain language would help make it clear if it's legit or just some new take on blockchain scamming