SOPHON is a project launched by a dev who previously worked for ZKSync. Also SOPHON is launching on ZKSync. Think about it like this, ZKSync is a platform and SOPHON is a gaming or entertainment universe launching on ZKSync. They are both hand in hand. Binance labs invested in SOPHON makes me think it is a cash grab.
Yeah it's basically a chain built around zksync technology and leverage the paymaster technology but more focused on entertainment as you said.
It's still too early to judge though, the entire chain is still lacking the ëntertainment aspect, only very few game has been released so far.
AFAIK even without binance lab, they're already making big money from node sales.