It wasn't only gamecredits that was a forgotten coin and was part of the top coin. I guess their time has passed and whether they promote good service to the community time will come that they will fade except bitcoin.
Here are some of the coins that were once part of the top coins;
These were some of the coins that ruled the crypto market in the earlier days. By that time these coins were listed among the top coins. Now these coins have gone above 200 on the entire list of cryptocurrency, while bitcoin secure its place at the first place forever.