The noncustodial wallet started working on the security alert feature in April 2023 and integrated it with Ethereum mainnet in January 2024.
MetaMask, a popular Ethereum-based self-custody crypto wallet, announced it would extend its default security alerts to web extension and mobile app users for multiple blockchains: Linea, BNB Smart Chain, Polygon, Arbitrum, Optimism and Avalanche.
The new security features come amid significant user growth for the wallet, which is nearing its peak in 2022. The monthly active users grew from 19 million in September 2023 to 30 million in January 2024. The user growth momentum was attributed to its mainstream partnerships with the likes of popular trading platforms such as Robinhood.
The security alert feature was first integrated on the Ethereum mainnet via an extension on Jan. 29, 2024. The security alerts warn users at transaction time whenever they interact with a known threat. The feature simulates the transaction being requested, recognizes malicious patterns, and warns users if a transaction is expected to result in fund loss.
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Source: https://cointelegraph.com/news/metamask-extends-security-alerts-amid-user-growth