Yes, IMO “unlimited slow requests” as a selling point needs to be reworded. It’s misleading at this point.
It’s more like “you get some extra slow requests, and eventually it becomes so slow that it’s no longer usable.” They should also show some table of how many slow requests you get per each wait milestone (e.g. how many requests you get to do before waiting 1 minute, 2 minutes, 3 minutes, etc. per request)