Team comps. For example, a full scaling team that’s down 3k against a full early game team could actually be even (or ahead!) and still activate Objective Bounties in their favor today.
I think this is a dangerous route to go down because it would somewhat require classifying champions as early or late game internally to the system, and inherently breaking that classification through some strange off-meta build could cause some weird cases where you can trick the system into giving bounties when it shouldn't. Maybe I don't quite understand the implementation of this if they went that route but it doesn't seem like a good idea coming at it from this angle.