So now I share a Netflix account with a friend where 2 people can look at the same time.
But can one be registered on 3 devices, but look at 2 at the same time?
For example, you are logged on 2 phones and a PC. At the same time you can't see on both phones, but on the third one. Is that possible?
That's fine. I share an account with 3 people and everyone has Netflix. Run on multiple devices. But it can never serve more than 4 at the same time (with you then 2)
Although there's a limit to how many can sign up but that should not be achieved under normal circumstances.
At the same time look is something else, as it depends on which subscription model you have.
You should also note that you then of course only 2 profiles. These profiles change depending on what you are looking at - it is then proposed depending on the viewing habits series / movies. You can also bookmark and start series / movies where you finished them. This of course works worse or not at all, if there's still someone else in the profile again and again herumwuselt.