Public cloud providers boast complete set of features. If you are looking for an end-to-end solution, you should go to public cloud providers. However, there are a few drawbacks.

Vendor lock-in. We all know it's pretty hard to migrate from one public cloud to another. ForS example, Google Cloud will shutter its IoT Core service in 2023. High cost. Given the big data & massive scale nature of IoT, running complete solutions on public clouds can be very costly.