Hasn't a fork happened before?
Yes. In July, bitcoin underwent a similar fork that led to the creation of bitcoin cash.
There was an initial surge in price, and it hit an all-time high of $914.45, but has fallen steadily, according to data from Coinmarketcap.com. On Wednesday, bitcoin cash was trading just above $330.
Bitcoin cash's market capitalization — the total value of the cryptocurrency in circulation — is just over $5.5 billion, compared to more than $93 billion for bitcoin.
you want to say bitcoin cash better than bitcoin
No, bitcoin more stable than bitcoin cash (only bumped price without real effect )