I'd extend this even further: never use a single account for more than one purpose. Create a separate account at the same company for the other purpose. Some examples: - Every product/project you manage should be on a separate account on Google, Facebook, Amazon, etc. - Nothing tied to your consumer accounts should be used for anything business related. - Your Amazon shopping account and your AWS account should defin…
> I'd extend this even further: never use a single account for more than one purpose. Create a separate account at the same company for the other purpose. This should really go without saying. I’m sometimes shocked at the extent to which it has become normalized to mix up one’s personal accounts with work. I can’t count the number of times a colleague accidentally sent me an email using their personal account, or tex…
However, in practice, using "Sign in with Google" by default dramatically increases resilience to most failure modes for almost everyone without a sophisticated threat model.
> To save what? An additional password?
The average person does not manage their passwords in a sophisticated way; if someone is signing up for many different services, they are probably using the same password everywhere, or some simple enumeration scheme. Then, when some random forum or web service gets compromised (as they inevitably are), their password to everything is compromised - including Google! On the opposite end of the spectrum, if Google is the only service with a password, and everything else is driven by Google-owned SSO, that person is essentially immune to compromise; whatever I think about the company, I do believe in Google's security team to keep passwords safe and block dictionary attacks more than any other service on the internet.
And while we can evangelize setting up password managers and using strong random passwords everywhere, the truth of the matter is that many people simply cannot accomplish this. "Sign in with {Google, Facebook, Microsoft}" gets them 95% of the benefit at much higher reliability.