One thing that should be noted is that a small team, which includes myself and @lito.coen from the Hop team, has been working on a UniV3 liquidity-mining campaign on Arbitrum and Optimism for the Uniswap DAO.
Details here:
I’m a fan of XToken and certainly interested in more players in the UniV3 farming game, however my slightly-biased opinion is that Hop should join Uniswap and provide incentives through this interface.