The main caveat to this currently is that someone would have to run an alternative to https://plc.directory, and everyone else would have to agree which one to switch to. I'll be a lot more comfortable with atproto once the directory has moved to a non profit like ICANN (as @pfraze mentions), or a different DID method gains wide adoption.

Is this a thing that is easily discoverable in settings where people can choose to use a different directory? OR is this buried and hard to find or know it could be a thing?

It's currently built into the applications, not configurable by default. It's preferable if everybody in a thread / space / community uses the same one because otherwise differences can cause validation failures and conflict and thus break threads, resulting in that people can't follow many discussions, thus applications don't really expose it.

It's the kind of thing where it's preferable that either everybody switch at once, or that new applications with different "lexicon" (post types / social media format) picks a new default from the start.

That's too bad, it made me think if there were easy to switch user perferences then it would be truly decentralized..

Is there a way to clone the app and make this easy to find as a button to switch?

(unfamiliar with the licensing and the app in general, some things I have seen make me excited that it's possible to be uncensored and decentralized, then things like this come up and I wonder if I should put time into it or something else to promote)

Everything is open source so yes you can, it's mostly a question of practicality.

There's already third party clients, account hosting servers, etc, as well as different apps building on the same system (and which can use the same accounts and data store!) like blogs and more. Most devs are trying to coordinate their custom extensions so it doesn't cause conflict.

If it weren't coordinated we'd easily end up in the same place as Mastodon with their spurious server blocks where large parts of conversations are broken for most users.

I'd love more info about "Mastodon with their spurious server blocks where large parts of conversations are broken for most users." - who and why that happens and what it looks like to the different users that have servers blocked or what not.. is it clear they are missing messages that are from blocked servers?

Yeah this is a good point, I was thinking purely about those two parts of the service, but if bsky is gone, then plc.directory would be too. Thanks.