I'm setting up Firebase analytics for my app for both android and ios. I just learned that there's a 50 custom parameters limit I can create, also learned there are prescribed event parameters that firebase suggests with recommended events.
My question is, are these prescribed parameters counted as custom parameters when used?
My guess is yes, but I want to be clear before I actually start coding and possibly mess up with the number of parameters.
By "custom parameters" do you mean custom parameters in event? If that's the case then limit is 25 per event.
Maybe you thought about custom parameters in reporting? Then the limit is indeed 50, but it is only for reporting.
If you ask about user properties then the limit is 25 per app and no - predefined/default user properties don't count, so you can add 25 user properties yourself.
As a general rule - usually default stuff doesn't count for limits.
For more info on up-to-date limits see here: https://support.google.com/firebase/answer/9237506