According to Chaincatcher news, as per the official announcement, Infura has announced that it will deprecate the Optimism Kovan and Arbitrum Rinkeby testnets starting today due to plans to phase out the testnets after the Ethereum merge. Please ensure to migrate to the new Goerli testnet endpoint as soon as possible to avoid any interruptions. (source link)

Chain Catcher news, the Ethereum explorer Etherscan tweeted that the browsers for the Rinkeby and Ropsten testnets will be deprecated on October 5, 2022, and will be set to read-only status in the foreseeable future, ultimately being phased out. Developers are advised to migrate contracts and deploy new contracts on Goerli or Sepolia.According to previous reports, the Ethereum Kiln testnet will shut down this week, and the Ropsten and Rinkeby testnets will also shut down in the fourth quarter of 2022 and the second quarter of 2023, respectively. (Source link)