Ethereum processes more transactions per day than Bitcoin. It offers more features. It consumes less power. It's pretty much superior to Bitcoin in every aspect. It would make more sense to run all Bitcoin transactions on Ethereum.
Yes, it is, thanks to Zero Knowledge proofs (and shards in the future), Ethereum will scale to 200K TPS (with proof of stake running 99.98% more efficiently than PoW:
Can you tell me anything about Bancor or bnt that a friend was shilling to me. Is this an altcoin? How do altcoins derive value or are they pretty much considered high risk/high reward gambling?
Bancor is an AMM (automated market maker) exchange. It is a decentralized exchange for trading tokens. Bancor as a protocol earns fees on every trade (just like Coinbase or Binance). It's one of the most popular AMMs and pulls in about $130K per day in fees: https://cryptofees.info/