BTC was hijacked in 2015 by the for profit Blockstream inc, which sabotaged scaling. It has first mover's advantage, but its market share is crashing (about 50% now, from 99%).
BitcoinCash was activated by Bitcoiners who disliked Blockstream's move and split the Bitcoin blockchain as a last resort action.
All the first mover forums became censored pro-Blockstream propaganda platforms so there were (and still are) huge anti-BCH campaigns being executed against BitcoinCash.
