I don't use CodeCommit, but I doubt that an average developer would be hitting the 2000-request boundary (that's 100 requests per day assuming a 5-day work week). Technical users like a CI might be more problematic.
I think it's 2000 requests overall, and if you add in a few buildplans for each of a few repos, you'll easily hit it. Still, it's not pricey if you do.
