The following documentation says this :-
SNS Filtering Messages Documentation
By default, you can have up to 100 filter policies per AWS account per region. To increase this limit, submit an SNS Limit Increase case.
What does 100 filter policies mean? Does it mean you can have 100 different keys all across your subscriptions? Or does it mean you can only have 100 subscriptions with filtering policies? (I don't think it is latter, but need to make sure)