For example, Cache, a Get is 0.0001$ per request, so, with the initial 5$ you would have 50k Gets that, given the nature of a Cache seems extremely expensive. I guess your highest costs are storing up to 1mb and egress traffic (If you are in a cloud provider) but, even for a side project I could destroy the 5$ by myself developing the project itself.
Other than that, loving it, and I will try to give it a go in the future, and check how the pricing affects my decisions.