Play with the same Minecraft account?

Can I log into Minecraft on 3 PCs at the same time with the same account, and even play a survival world together on 2 of the 3 PCs (via LAN)?

I could also deregister one of the PCs, it is also not in the same Wi-Fi as the other two and it is also not used in parallel…

I think logging in at the same time is not possible in the same world
But I'm not sure

If I got that right, would you like to have a ONE Minecraft or Microsoft account with several people or yourself, again with several PCs?

Do not think that this is possible, because Mojang wants to earn money by having other people buy it

It doesn't work at the same time, otherwise it would be theoretically like two accounts.

Playing one after the other on other PCs would work but then you always have to log in.

You can only be on a server once per account. Otherwise it would work if you are on different servers.

Registering at the same time and playing on different servers works, but does not work on the same server or the same LAN world. The PC that was previously connected to the account is kicked when you log in to the 2nd PC.