Spot the folks around pre 2013-14

Classic.... That's not what MAX_MONEY does

Hugely rusty but .....
I think it's only used as a sanity check while building transactions (you can't send more coins than there will ever be)

The reward is way more complex (at least in BTC) where the calculation is done from multiple halvings of the orignial 50 BTC per block.
In a file that does not exist in HBN .. Validation.cpp ---------- getsubsidy or some such function

You'd have to do some digging around in the code for HBN

I'm pretty sure HBN will just stake straight off the end of 120mm and keep going.

DYOR