Lombard rules / unfair overdraft rates

Just saw this bit in changes:
“- We don’t include any money you have in Pots when we calculate how much you’re overdrawn by, so you can still go overdrawn with money in your Pots”

This is totally unfair.
I know this is how traditional banks do it, but it’s unfair.

If I owe you £100 and you also owe me £100, none of us should pay the other interest. At best, maybe a really low lombard interest rate, but not 34% (usura rates).

I don’t know why Monzo thought this was a good idea.