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I though this was just a crazy commenter, but here:

https://rabbit-labs.com/product/cancommander/

Crazy commenter, tell us a little about this. Can I use it on any Can bus?

CAN is a protocol, but the messages on the bus are implementation specific. Yes, you can use it on any CAN bus, but there's no guarantee that you will be able to decode the traffic. Some modern CAN networks are encrypted, too, because it's trivial to view the traffic. https://kentindell.github.io/2021/01/02/can2-wireshark/ has a great guide on decoding traffic with sigrok.

From what I understand the CAN traffic on my vehicle is encrypted. Clearly this does not apply to all of the traffic, as I can fetch some OBD2 data with a generic dongle.

The data on the OBD2 port is legally mandated, so can't be encrypted. But besides encryption CAN buses in a car are also separated, the bus on the OBD2 plug often can't even talk to the most interesting components.

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