Cycling and determination.

You mean a service that translates between ActivityPub and another API? I’m pretty sure that’s just a bridge.

As for the challenges:

• It would have to be maintained constantly.
• It would have to be updated to reflect changes to an API in a timely manner.
• It would need to handle different versions of APIs (goodness knows even Lemmy instance operators have trouble with that).
• It would need to handle features that don’t translate one-to-one between instances.
• It would have to be transparent enough to allow a non-technical user to use it, but opaque enough that a non-technical user doesn’t blame issues with the bridge on the connected services (see for example: the Bottles packaging kerfuffle).
• …and so on. Lots of challenges.

Yikes. Disappointing. “The reality that I recognise as true is the only reality that can exist and everything that doesn’t fit is religious dogma” sounds awfully familiar.

You’d have better luck expecting a fish to climb a tree than Trump to form an abstract thought.