iCloud?

[question everything]

I don’t use it. I prefer to limit personal information floating someplace..

Recently after my iPhone was updated I was faced, in the Settings section, with a comment that I needed to agree to “terms and Conditions” for both iCloud and Apple Media Services. I have ignored this.

Shortly after, I am faced with a note that it has been - duration varies - “since the last backup for this iPhone.”

I use my iPhone for calls, mail, texts, some photos and checking local weather. Also visiting Facebook (I don’t post anything) and local Nextdoor which has been helpful. There is nothing to “back up,” but there is a clickable “Backup Settings.”

There is also a clickable OK below these two messages.

And today I am getting an email from iCloud that I have used over 50% of my iCloud storage.

How? I have never even clicked on iCloud. I certainly have not used it to store “photos, videos and documents.”. What are they talking about? Of course , with some payment I can get more storage. They are specifically talking about the iPhone, not my iMac which does contain documents and photos. I have no videos anyplace.

How can I get them to leave me alone?

I am not an expert. I use the computer to serve me, not the other way around.

Any advice? Thanks.