Upon reading on AZURE Event Hub,
As I am not an integration (messaging) expert, the following then:
The AZURE EVENT HUB KAFKA look-like API means that, if you, say, all send a JSON format using all 3 protocols, they can be mapped to the same Event Hub (= Topic), and one can read the Event Hub in KAFKA mode, say.
This is a good read https://learn.microsoft.com/en-us/azure/event-hubs/event-hubs-exchange-events-different-protocols but I checked with a more experienced person to confirm.