I wouldn't really count "sending a OTP via DM" as "Nostr login." By that logic, sending a OTP to a Gmail account would count as "Google login."
Am I off-base with that assessment #Nostr?
nostr:nevent1qvzqqqqqqypzqejwqu87yhnkmh8054yjnsx7gtk26zqspy6s0cjdu33zqagumda2qqsw9kvn7yhcdan4a42tqmjg4fquzztqccman99npxulj028jka4u9sku3ztf
#askNostr
Sending an OTP to Gmail would count as email login.
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Email is a protocol. Gmail is an application on top of the protocol. Same with Nostr and Clients.
Fair point, but I don't think anyone would really consider receiving a OTP to their Nostr DMs as "Nostr login." Nostr 2FA, maybe, but not login.