A toy like that is easy to create and not that expensive to offer. Much more expensive than some JavaScript or CSS, but in the end it's not that different.
I think people don't really understand this whole scraping thing. For example, you can torrent all of Reddit until the API-change; all the comments, profiles, usernames, including now deleted stuff. There is a lot of outrage here over Reddit cracking down on these 3rd party tools. It's difficult to see how that outrage over cracking down on 3rd party tools, fits with this outrage here over not cracking down on 3rd party tools.
Anyway, if someone want to archive all of Bluesky, they don't need to offer some AI toy. They can just download the content via the API.