This was a tip from Tiziana Barrow:
USE CASE: A client wants to score on 140 countries.
There is no current technical limit on the number of criteria within a model, rules within a criteria, or values within a rule. However you don't want the model to become too large to manage or takes too long to execute, but it would depend on the number, type, and complexity of the rules involved.
It's more efficient to define 4 rules that cover 35 countries each than to define 140 rules that cover 1 country each, but both should technically be possible. It's also more efficient to use "in set" or "equal to" operators instead of "match" or "contains", i.e. match on the exact country name or country code.