I could create a scam/risky API that Keplr could integrate, or you could directly query. Would check the tx for links, keywords (claim, gift, airdrop, etc.), addresses that send out dust tx’s, and more. Honestly this isn’t something I’d do for free though. I’d recommend reaching out to Cosmos leadership: @Mag @bpiv400 if you think this is a serious problem or the Keplr folks. If money was ever allocated to this effort I’d be happy to do it. Otherwise, you’re left to your best judgement.