In this recent question the issue came up as to whether shared accounts were permitted on Stack Exchange. I remember this having been discussed many times over the years, and the consensus has always been something like (my paraphrasing):
Yes, you can share an account if you want. It's not like we can tell who's using it, so it wouldn't be practical to enforce a rule to the contrary. But by doing so, you assume the implied risks: misbehaviour from one user could ban all of you, or they could steal the account. You won't get any special support if this happens.
From "What is the view on accounts shared by multiple users on Stack Overflow?" (2011), by jjnguy (former SO moderator):
Why not? Just because more than one user may manage this account doesn't devalue their contributions.
Do you really want to force people to verify that their account is used by the same person every time? I'm not sure if that is even possible.
This same thread has a post from Shog (current community manager) explaining why we don't need to treat this as a distinct case from individual accounts.
In 2012, Korneel Bouman (then a Stack Exchange Product Manager) gave a user instructions on how to share their account with coworkers.
However, Stack Exchange's Terms of Service have apparently been written to contradict this:
Subscriber certifies to Stack Exchange that Subscriber is an individual
Stack Exchange Inc. should update the Terms of Service to reflect the preexisting community consensus, instead of overriding it.
There are many recent posts citing the Terms of Service to say that users can't share accounts, but that's putting the problem backwards. If Stack wants to restrict users of Talent, they may, but the community's decision should be respected with respect to general participation.