Is it because Bitcoin is the most original one? Does it have to do with its price? Or does it have to do with its broad, generic name? Or because it's more widely adopted by many companies? In other words, is there some sort of complicated blockchain technology that will always make the Bitcoin most predominant one among different forks regardless of any circumstances? Is it theoretically possible for forks like Bitcoin Cash, Bitcoin Gold, Bitcoin SegWit2X to be more predominant than Bitcoin in the future? I don't know much about blockchain technology and I wonder if it's ever related to the fact that Bitcoin's the most predominant one.
By seeing the condition, I think the reason is so simple, BTC is the best known and most popular coin in the crypto world - so if someone wants to make a logical clone / fork to copy BTC and use the name "Bitcoin" to promote new coins. . that's my opinion. Such promotions mostly bring in new users who are unaware of the difference between real coins and forks, but for them behind the project it is not important at all - profit is the only thing that matters