It's not "down 80%" for anyone but dumb money who jumped in at the peak last November. BTC is up over 10,000% since 5 years ago.
And two years ago it was at $600. Everyone who jumped on the bandwagon last November during the $18k pump completely misses that fact. BTC has been the single biggest wealth transfer from institutions to individuals of our generation.
Please explain how turbulence in BCH affects Bitcoin and Ethereum.
BCH is a totally different coin, on a different blockchain, with a far smaller market cap than the "big boys" BTC or ETH. Its a poor explanation at best. Its the only thing that correlates to the drop, but it doesn't make sense as an explanation.
Come again?
The recent behavior certainly goes against the notion that BTC is digital gold. Seems like it's correlated with general market sentiment like most other financial instruments.