Are there any (security) reasons to not implement 2FA on a website or service you run?

are-there-any-(security)-reasons-to-not-implement-2fa-on-a-website-or-service-you-run?

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Recently I was sitting in the discord of an online game platform and in the suggestions someone had sort of aggressively demanded that the developers add two factor authentication for accounts. In this particular instance, the accounts had no value or persistent information outside of email address, so the only threat that I could think of is connecting a (username/ password) to an email, but you could get the email a different way. Personally, I was more interested in the devs (who were just doing this as a hobby) working on other more gameplay related features, so I pushed back against the poster, but it got me wondering if there were actual cybersecurity reasons to not just throw 2fa on top of something.

Only things I came up with:

  1. Time/ money/ resources to implement 2fa. This isn't really a security reason.

  2. Incorrect implementation leaks info in a way that makes it worse than no implementation. I'm not sure exactly how this would manifest itself (perhaps leaking e.g. a phone number if that was the 2fa method of choice) but I can imagine how that might cause issues.

  3. False sense of security. I'm not sure this is actually a big deal since people are already reckless with their passwords anyway, but hypothetically someone could use a weaker password under the assumption that 2fa allows that. Still needs some misimplementation to take advantage of that though.

I'd be interested if there are other reasons or if generally a service should always have this option available to people.

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