Our game is using Parse to store player's score. Current free Parse plan is 30 req/sec limit. Right now we have just 200 users and that's enough.
But this week we are going to make big marketing push and probably we will reach request limit.
What will happens after that?
Is requests will be dropped until we switch to paid plan?
Should we take care about that beforehand and switch to paid plan?
User request will be dropped if they are over and above 30 req/sec.
But I do not think that you should make the switch now.
Keep the track of your users requests and only upgrade the plan once you find that your request count are above free plan limit.