It kinda does make sense. You have specialist dating services:
Kinky
Uniform dating
Pensioners
At least one newspaper had a dating service for people who were politically similar
Sugar daddies
And on and on.
So each of those could be an instance so people with similar… needs are grouped together but it’s federated, so you could be on a Democrat dating instance but also throw your hook into the pool of pensioners or Californians, etc, etc.