Looks like they're still active on bitcoin talk https://bitcointalk.org/index.php?action=profile;u=26945 as of last month.

Their last comment was in 2020 in a datacoin forum and their name of DTCxNMC (I think nmc is namecoin) suggests they went into alts.

Twitter search for that nym though doesn't surface anything that looks legit https://twitter.com/search?q=GameKyuubi&f=user