Liquidity providers on the Synapse bridge are currently being emitted SYN tokens on 11 different chains. In order to trade their rewards, those liquidity providers currently have to bridge those SYN tokens to Mainnet and trade them on Uni/Sushi.
Under the “tokenholders” portion of the proposal, $OP tokens will be used to create and incentivise a liquidity pool on Optimism. As gas fees on Optimism are significantly lower than Mainnet, we would expect a significant portion of small-to-medium size farmers to bridge their SYN rewards to Optimism going forward and use it as their main chain to trade their rewards . This is because i) bridging SYN tokens to Optimism will be less expensive than mainnet (less gas required for the Synapse bridge to function) and ii) the gas they will pay to sell them on Optimism will obviously be cheaper.
To put it in context, every single chain Synapse is on has, at any point in time, at least 100 different liquidity providers (often more) with those wallets also changing over time depending on changes in APYs etc. Most Synapse liquidity providers will likely discover and start using Optimism thanks to that proposal.
Additionally, Synapse always airdrop bridge users some ETH as gas which means onboarding those new wallets within the Optimism ecosystem will be quite easy.
Finally, other wallets will likely come to Optimism and use that pool to trade SYN to avoid paying Mainnet gas fees (there are a few thousands of SYN holders).
As such, we would expect that portion of the proposal to bring an influx of new users to the Optimism ecosystem.