Andreas

You can spin up a regular instance, check "Close signups" and uncheck "Enable federation" in your admin settings, which will make your instance a private forum that is accessible from the internet.

Archiving publicly available content is not illegal, otherwise sites like archive.org would have been taken down ages ago.

Users are where the content is, and most people don't have the energy to support a growing website that lacks content when another website that is full of content exists. Reddit's advantage was that people only needed one account on one website to see content related to diverse interests. Mirroring Reddit content (while being transparent about the fact that the content is mirrored) can help the Threadiverse gain this advantage and make it easier to retain users who will eventually contribute to the Threadiverse.

(In Reddit's early days, it was full of Digg crossposts too.)

The purpose of the bot is to make Reddit's content accessible without being forced to use a corporate platform. The value Reddit has, in my opinion, is the wealth of knowledge that is stored there. The content is often stale, but most of us have experienced finding a solution to a problem from a years-old Reddit thread. If you used Reddit for social interactions, this bot is not the solution for you.

Is the body of the post not appearing on certain apps or something? There is a summary that explains the bot's purpose in the post body.

This "anyone is free to join any instance, you can just avoid what you don't like" kind of thinking is perfectly reasonable in theory, but I think what OP wants to know is if this also holds up in practice. You could "defederate" Google and Microsoft by blocking emails from Gmail and Outlook addresses, but the reality is that the majority of people you will need to contact use those addresses. In most cases, your school/workplace will even make you use them for your organizational email. Yes, it is possible to avoid these companies and choose alternatives, but you'll be isolating yourself from the majority of the network.

The question is not if it will be possible to use the future corporate-owned Fediverse without Meta (of course it will), but if it will be feasible for the majority of users.

What "ages ago"?! It was purchased in 2014 and shut down in 2015!

Oh wait, that was 8 to 9 years ago.

I still have my Alien Blue installation after all these years and it's working for me too, probably because the number of users left is so low that it can operate under the new API limits. Unfortunately, Reddit could easily kill off Alien Blue by revoking its API key.

Explained in the post. A very common complaint I see in the migration discussions is "my hobby's community isn't on the Fediverse/doesn't have an active community like Reddit so I still have to visit Reddit". Unless they intend to participate in that Reddit community (which most users don't), they can bring their community's knowledge here instead of giving Reddit more traffic.