Earlier this month, the Mastodon project announced a new initiative funded by NGI Search: Fediverse Discovery Providers! The goal is to build a resource framework for different kinds of services that can work with potentially any instance or platform.
It’s adding centralisation where there’s no need for any. In the same way that BlueSky cosplays as decentralized, this is what this effectively tries to move towards. In that whoever runs the relays/indexers is in control.