I'm wondering what could've lead Binance Coin towards new heights within such a short amount of time?
Binance Smart Chain.Does the "De-Fi" hype have to do anything about this?
Yes, because of those projects that are choosing BSC over ETH (ERC20). It's more efficient for them and have lower fees and that made BNB put into a crazy ATH.Do you think BNB's current prices are sustainable or not? Your input will be greatly appreciated. Thanks. 
It is sustainable, it has once reached $300 and its current price seems stable and calm.