If your BTC is on an exchange, whether you receive $ECX at the fork is entirely up to them.
@coinbase holds ~970K BTC on behalf of its users.
@binance holds ~665K BTC. Every one of those users gets $ECX, but only if those exchanges decide to credit them.
Vote for the exchange you want $ECX listed on. Every vote and email lands on that exchange’s desk. Refusing to credit BTC holders is a choice, and it’s one their users notice.
Tell your exchange what you want: