SIS is the token of the Symbiosis protocol. It is used for staking to run relayer nodes in the Symbiosis relayers network and governing the Symbiosis DAO and DAO Treasure. Furthermore, Symbiosis incentivizes users in SIS tokens for participating in the protocol activities such as liquidity provision.
Moving SIS into the BNB chain has a two-fold rationale. On the one hand, Symbiosis v2 has been deployed on BNB L2 managing network, making the whole system more smooth, secure, and efficient. Besides, Symbiosis belongs to the Binance Ecosystem and aims at developing accordingly.
Also, since the SIS token is on Ethereum, and the transaction fees that are paid in Ether sometimes become uncomfortably high, it reduces the interest and yield of Symbiosis users.