Sorry, this isn’t a good approach for a couple of reasons:
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Risk Aversion of Stablecoin Holders: People who currently hold stablecoins on the Polygon PoS bridge have chosen to keep their assets there because they perceive it as a low-risk environment. By placing these stablecoins into a vault, you would be compelling these holders to take on additional risk without any corresponding reward. This could lead to dissatisfaction or loss of trust among users who value the stability and safety of their current holdings.
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Upcoming Changes to the Bridge: The Polygon PoS bridge is scheduled to be upgraded to the AggLayer unified bridge in just a few months. Any benefits from placing stablecoins in a vault would only last for this short interim period, making the effort and potential complications not worth it. The transition to the new bridge could also introduce unknowns or additional risks that might not be fully understood or appreciated yet.
Given these points, the temporary gain from vault interest doesn’t justify the disruption and potential risks to the stablecoin holders on the bridge.