Microsoft Intrusiveness

At school we could potentially use any computer in the school.. We might use a computer in one classroom and another in another classroom or another in the library. We logged on with one network account and password rather than a local account for each computer. After using 15 accounts and passwords for the computer system, e-mail, Blackboard, MySchool, etc,. it occurred to me that I might want to use a password on my home computer. So, I added a familiar password. Then, after some weeks had gone by, I went to logon and I noticed the account was labeled Administrator. That surprised me because I specifically have an Administrator account aside from the local Standard account I use daily.

So, I investigated it. Why was my local Standard account now labeled Administrator?

I went to System Settings and there the account was shown as an Administrator AND that it now had the network logon account I have been using for school access to Microsoft Outlook (Microsoft's e-mail system). How could that have happened? Am I just forgetting something I have done? That's certainly a possibility these days.

Was this an accident I created or was this something Microsoft was doing to insinuate itself into my computer? Do they want everyone to login to Microsoft to use their home personal computer?

I had to cut off that tentacle immediately. I created another account and changed my personal computer's login to that local Standard account.

At school I used an Outlook account for e-mail and a regular Microsoft account to get access to some free software I could download for my school work. Had these followed me home? Then I noticed something else curious. When you 'manage' one of these "not my local Standard account"s it doesn't give you the option to simply delete the listing of it. It loads a browser and goes to the Outlook (Microsoft's e-mail system) login. Why would I want to login to Microsoft just to delete the listing of that account as a way to logon to my home computer. I'm not a Microsoft employee. If I want to use the Microsoft service I'll go to their webpage and logon there. I don't need to logon to my personal computer via that siter. At that moment the word "personal" seemed to be losing some of its meaning.

I decided to go through Control Panel to User Accounts and see if anything different appeared. It did. The old Windows 7 way showed the account as Standard. Clearly windows 10 was doing something new and different. The old Windows 7 User Accounts also didn't associate an e-mail address or corporate logon account with a home personal computer logon.

So, I now use the new standard user account to login at home, but I still have the Microsoft account listed as a way to logon to my own home computer. Strange.

QUESTION: Is Microsoft trying to further entangle itself with our home computers? What can be done to prevent it?