If this is done automatically, the appearance of the avatar will be very distorted. Imagine that you want to automatically resize 1200*630 to 120*80, and remember that the space is only 100 KiB size.
I once tried to edit a photo from the phone camera into an avatar, and the results were not good. Therefore, the more digital or computer-generated avatar, the clearer and better the results.
Remember : don't upload avatar many time then it can be suspended.
are you sure? This is the first time I've heard of an account whose avatar was banned or suspended