I guess my point is federated services, at least prior to a world where they become mainstream, are only particularly good if

1. You have a group of people all willing to use them together (IE Matrix, Friendster etc…), Join as a group don’t expect to find other specific individuals.

2. If you do want to meet people, you are looking for pretty broad categories encompass millions. IE on lemmy you can certainly find an anime community, you won’t find an active jujitsu kaisen community.

Anyway so my point on things like Dating, Linked In etc… those topics are likely to be the last to have a hope in the federation, because their services on their own, require users, but more importantly those users have to be localized (IE dating sites need, both a high volume of users, and those users need to be in close geographical proximity, and have some reasonable male to female ratio, and then have some level of common interests). A linked in needs… job seekers, and companies/head hunters. Of which you can’t expect companies to put in resources without a large userbase… and you can’t expect the userbase to grow without company usage.