Is Arkham not on Coinbase?

Could you clarify for me, I've been trying to find Arkham listed on Coinbase, but it seems to be absent. Is there a specific reason why Arkham isn't available on the Coinbase platform? Could it be due to regulatory concerns, technical difficulties, or simply a lack of interest from Coinbase? As a cryptocurrency enthusiast, I'm curious to understand the factors that influence a coin's inclusion or exclusion on major exchanges like Coinbase. Your insights would be greatly appreciated.