-The value of it was high enough for their users to demand it
-It had a functioning codebase
-It was secure for them to implement support.
However, since "Bitcoin Gold" was an extremely shady group who listed a scam on their website that stole millions of dollars, failed to protect their official client from malware and basically rode off the back of BCH anyway, I find it hard to believe that there's any more relevant forks to come.
Were did you get your info that btg is such a scam, would be interested to hear more.
That's the one:
https://www.reddit.com/r/CryptoCurrency/comments/7drv3v/scam_warningbitcoin_gold_wallet_stole_all_my/
https://www.coindesk.com/bitcoin-gold-wallet-scam-nets-3-million-illicit-earnings/
And the more recently fiasco: https://bitcoingold.org/critical-warning-nov-26/
thanks for sharing that. We have to be so careful. its almost possible that someone would create a fork in order to steal private keys like that.