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Kraken is a cryptocurrency exchange that utilizes (at least) two different TOTP codes, one for login and one for money transfers.

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For a long time (still?) Kraken also refused to add SMS 2FA as an option due to its weak security.

I still don't see how that's worse than no 2FA at all, which was an option, but I appreciated that they were banging the "SMS 2FA isn't very secure" drum.

It’s worse in a lot of implementations because often SMS is often used as part of a recovery flow in cases where you lose the first factor.

I find it more secure in some contexts to never give a company my phone number at all if possible, so that it simply can’t be used as any kind of authentication no matter what.

Yeah, I'd draw a hard line between "SMS 2FA is better than no 2FA" and "SMS should never become a single-factor recovery method."

I agree SMS should never be an option for single-factor recovery.

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