The uceprotect Level 3 page clearly says using the list will cause collateral damage and should only use as an indicator as part of a spam score, not to act purely on it.

So, yes, if a service provider is known for having a lot of spam coming from it, it makes sense to be on there. They're not saying every IP is bad, they're literally stating the opposite (which seems fair).

So, if Orange are blocking purely based on it, not only are they using a spam filter as a DNS query/web filter (given uceprotect seems to flag based on mail spam traps based detections etc.) and ignoring their documentation (which says it shouldn't be used to block on it's own).