@scottjenson@social.coop When I first joined the Fediverse, there was a site called Trunk (maybe "Trunks"?) where one could sign up to be listed under a certain descriptor. For instance, if one went looking for "Librarians", I was listed there.
I'm not sure if it still is maintained, and it's also not as elegant or user-generated as those "Starter Packs."
To its credit, Trunk did seem to ensure that people listed on it were consenting to be; the big critique I've seen of BlueSky's current "Starter Packs" is that one can be listed on many of them with no clear indication other than an increase in followers or engagement, and with no clear way to opt out.