#CryptoETFMania Bitcoin (BTC) dropped below $ 42,000 on Friday, plunging almost 10%, as the euphoria over the Bitcoin ETFs approved, this week gave way to a massive rout.

The declines happened a day after spot Bitcoin exchange-traded funds (ETFs) began trading, marking a significant milestone for the industry.

Bitcoin ETFs are traditional financial vehicles that may give retail and institutional investors alike easier exposure to Bitcoin's price.