Why does signing out suddenly de-activate office?

I have office 365. I used to be able to sign out of an office application and the application still worked. I recently made the mistake of updating the office application where Office 365 is now Microsoft 365. It now seems I HAVE to sign in and stay signed in on my own computer where I downloaded and installed my office products to keep using MS Office. When I sign out, the office product deactivates. I don't want to be signed in to use the product that I paid for. It now means that everyone in my family who use the same computer also use my Office account with my name on each office application. Why did this policy change and can we get the previous policy back?

At https://www.reddit.com/r/Office365/comments/fyzfe6/how_to_logout_from_office_365_word_without/ a user commented:

"Yes you used to be able to sign out of Office 365 and it would still stay activated based on the original MS account that has the Office 365 subscription on it... BUT NOW since they changed the name to Microsoft 365 the NEW installers/program are different and if you sign out then it will deactivate Office and make you sign back in... if you updated from an older install then it still seems to let you log out even with the newest updates... but if you did an Online repair then you will be forced to stay signed in... once signed in with a valid subscription account you can sign in with any another microsoft account instead and it will keep the activation still.."

Please revert this manner of using Office products that have been paid for.