Why limit split cost and money requests to 100 pounds?

Tom confirmed 50p per £100.

What it boils down to though is whether this is a 0.5% charge or whether it is something like a 1p + 0.4% charge.

If it’s the latter it costs less for Monzo if it’s done within a single transaction rather than multiple - a bit like Amex:

If it was just percentage, it wouldn’t make a difference if it was batched up, or individual itemised transactions.